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Featured researches published by Yating He.


Science of The Total Environment | 2015

Long-term combined chemical and manure fertilizations increase soil organic carbon and total nitrogen in aggregate fractions at three typical cropland soils in China

Yating He; Wenju Zhang; Minggang Xu; X.G. Tong; F.X. Sun; Jinzhou Wang; Shaomin Huang; P. Zhu; Xinhua He

Soil organic carbon (SOC), total nitrogen (TN), microbial biomass carbon (MBC) and nitrogen (MBN) are important factors of soil fertility. However, effects of the combined chemical fertilizer and organic manure or straw on these factors and their relationships are less addressed under long-term fertilizations. This study addressed changes in SOC, TN, MBC and MBN at 0-20 cm soil depth under three 17 years (September 1990-September 2007) long-term fertilization croplands along a heat and water gradient in China. Four soil physical fractions (coarse free and fine free particulate organic C, cfPOC and ffPOC; intra-microaggregate POC, iPOC; and mineral associated organic C, MOC) were examined under five fertilizations: unfertilized control, chemical nitrogen (N), phosphorus (P) and potassium (K) (NPK), NPK plus straw (NPKS, hereafter straw return), and NPK plus manure (NPKM and 1.5NPKM, hereafter manure). Compared with Control, manure significantly increased all tested parameters. SOC and TN in fractions distributed as MOC > iPOC > cfPOC > ffPOC with the highest increase in cfPOC (329.3%) and cfPTN (431.1%), and the lowest in MOC (40.8%) and MTN (45.4%) under manure. SOC significantly positively correlated with MBC, cfPOC, ffPOC, iPOC and MOC (R(2) = 0.51-0.84, P < 0.01), while TN with cfPTN, ffPTN, iPTN and MTN (R(2) = 0.45-0.79, P < 0.01), but not with MBN, respectively. Principal component analyses explained 86.9-91.2% variance of SOC, TN, MBC, MBN, SOC and TN in each fraction. Our results demonstrated that cfPOC was a sensitive SOC indicator and manure addition was the best fertilization for improving soil fertility while straw return should take into account climate factors in Chinese croplands.


Journal of Arid Land | 2014

Litter decomposition and C and N dynamics as affected by N additions in a semi-arid temperate steppe, Inner Mongolia of China

Qin Peng; Yuchun Qi; Yunshe Dong; Yating He; Shengsheng Xiao; Xinchao Liu; Liangjie Sun; Junqiang Jia; Shufang Guo; Congcong Cao

Litter decomposition is the fundamental process in nutrient cycling and soil carbon (C) sequestration in terrestrial ecosystems. The global-wide increase in nitrogen (N) inputs is expected to alter litter decomposition and, ultimately, affect ecosystem C storage and nutrient status. Temperate grassland ecosystems in China are usually N-deficient and particularly sensitive to the changes in exogenous N additions. In this paper, we conducted a 1,200-day in situ experiment in a typical semi-arid temperate steppe in Inner Mongolia to investigate the litter decomposition as well as the dynamics of litter C and N concentrations under three N addition levels (low N with 50 kg N/(hm2·a) (LN), medium N with 100 kg N/(hm2·a) (MN), and high N with 200 kg N/(hm2·a) (HN)) and three N addition forms (ammonium-N-based with 100 kg N/(hm2·a) as ammonium sulfate (AS), nitrate-N-based with 100 kg N/(hm2·a) as sodium nitrate (SN), and mixed-N-based with 100 kg N/(hm2·a) as calcium ammonium nitrate (CAN)) compared to control with no N addition (CK). The results indicated that the litter mass remaining in all N treatments exhibited a similar decomposition pattern: fast decomposition within the initial 120 days, followed by a relatively slow decomposition in the remaining observation period (120–1,200 days). The decomposition pattern in each treatment was fitted well in two split-phase models, namely, a single exponential decay model in phase I (<398 days) and a linear decay function in phase II (>398 days). The three N addition levels exerted insignificant effects on litter decomposition in the early stages (<398 days, phase I; P>0.05). However, MN and HN treatments inhibited litter mass loss after 398 and 746 days, respectively (P<0.05). AS and SN treatments exerted similar effects on litter mass remaining during the entire decomposition period (P>0.05). The effects of these two N addition forms differed greatly from those of CAN after 746 and 1,053 days, respectively (P<0.05). During the decomposition period, N concentrations in the decomposing litter increased whereas C concentrations decreased, which also led to an exponential decrease in litter C:N ratios in all treatments. No significant effects were induced by N addition levels and forms on litter C and N concentrations (P>0.05). Our results indicated that exogenous N additions could exhibit neutral or inhibitory effects on litter decomposition, and the inhibitory effects of N additions on litter decomposition in the final decay stages are not caused by the changes in the chemical qualities of the litter, such as endogenous N and C concentrations. These results will provide an important data basis for the simulation and prediction of C cycle processes in future N-deposition scenarios.


Journal of Environmental Sciences-china | 2014

Differential responses of short-term soil respiration dynamics to the experimental addition of nitrogen and water in the temperate semi-arid steppe of Inner Mongolia, China

Yuchun Qi; Xinchao Liu; Yunshe Dong; Qin Peng; Yating He; Liangjie Sun; Junqiang Jia; Congcong Cao

We examined the effects of simulated rainfall and increasing N supply of different levels on CO2 pulse emission from typical Inner Mongolian steppe soil using the static opaque chamber technique, respectively in a dry June and a rainy August. The treatments included NH4NO3 additions at rates of 0, 5, 10, and 20 g N/(m(2)·year) with or without water. Immediately after the experimental simulated rainfall events, the CO2 effluxes in the watering plots without N addition (WCK) increased greatly and reached the maximum value at 2 hr. However, the efflux level reverted to the background level within 48 hr. The cumulative CO2 effluxes in the soil rang ed from 5.60 to 6.49 g C/m(2) over 48 hr after a single water application, thus showing an increase of approximately 148.64% and 48.36% in the effluxes during both observation periods. By contrast, the addition of different N levels without water addition did not result in a significant change in soil respiration in the short term. Two-way ANOVA showed that the effects of the interaction between water and N addition were insignificant in short-term soil CO2 effluxes in the soil. The cumulative soil CO2 fluxes of different treatments over 48 hr accounted for approximately 5.34% to 6.91% and 2.36% to 2.93% of annual C emission in both experimental periods. These results stress the need for improving the sampling frequency after rainfall in future studies to ensure more accurate evaluation of the grassland C emission contribution.


Journal of Arid Land | 2014

Response of soil N2O emissions to precipitation pulses under different nitrogen availabilities in a semiarid temperate steppe of Inner Mongolia, China

Xinchao Liu; Yuchun Qi; Yunshe Dong; Qin Peng; Yating He; Liangjie Sun; Junqiang Jia; Congcong Cao

Short-term nitrous oxide (N2O) pulse emissions caused by precipitation account for a considerable portion of the annual N2O emissions and are greatly influenced by soil nitrogen (N) dynamics. However, in Chinese semiarid temperate steppes, the response of N2O emissions to the coupling changes of precipitation and soil N availability is not yet fully understood. In this study, we conducted two 7-day field experiments in a semiarid temperate typical steppe of Inner Mongolia, China, to investigate the N2O emission pulses resulting from artificial precipitation events (approximately equivalent to 10.0 mm rainfall) under four N addition levels (0, 5, 10, and 20 g N/(m2·a)) using the static opaque chamber technique. The results show that the simulated rainfall during the dry period in 2010 caused greater short-term emission bursts than that during the relatively rainy observation period in 2011 (P<0.05). No significant increase was observed for either the N2O peak effluxes or the weekly cumulative emissions (P>0.05) with single water addition. The peak values of N2O efflux increased with the increasing N input. Only the treatments with water and medium (WN10) or high N addition (WN20) significantly increased the cumulative N2O emissions (P<0.01) in both experimental periods. Under drought condition, the variations in soil N2O effluxes were positively correlated with the soil NH4-N concentrations in the three N input treatments (WN5, WN10, and WN20). Besides, the soil moisture and temperature also greatly influenced the N2O pulse emissions, particularly the N2O pulse under the relatively rainy soil condition or in the treatments without N addition (ZN and ZWN). The responses of the plant metabolism to the varying precipitation distribution and the length of drought period prior to rainfall could greatly affect the soil N dynamics and N2O emission pulses in semiarid grasslands.


Journal of Geographical Sciences | 2012

Effects of a conversion from grassland to cropland on the different soil organic carbon fractions in Inner Mongolia, China

Yuchun Qi; Yunshe Dong; Qin Peng; Shengsheng Xiao; Yating He; Xinchao Liu; Liangjie Sun; Junqiang Jia; Zhijie Yang

Cultivation is one of the most important human activities affecting the grassland ecosystem besides grazing, but its impacts on soil total organic carbon (C), especially on the liable organic C fractions have not been fully understood yet. In this paper, the role of cropping in soil organic C pool of different fractions was investigated in a meadow steppe region in Inner Mongolia of China, and the relationships between different C fractions were also discussed. The results indicated that the concentrations of different C fractions at steppe and cultivated land all decreased progressively with soil depth. After the conversion from steppe to spring wheat field for 36 years, total organic carbon (TOC) concentration at the 0 to 100 cm soil depth has decreased by 12.3% to 28.2%, and TOC of the surface soil horizon, especially those of 0–30 cm decreased more significantly (p<0.01). The dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at the depth of 0–40 cm were found to have decreased by 66.7% to 77.1% and 36.5% to 42.4%, respectively. In the S. baicalensis steppe, the ratios of soil DOC to TOC varied between 0.52% and 0.60%, and those in the spring wheat field were only in the range of 0.18%–0.20%. The microbial quotients (qMBs) in the spring wheat field, varying from 1.11% to 1.40%, were also lower than those in the S. baicalensis steppe, which were in the range of 1.50%–1.63%. The change of DOC was much more sensitive to cultivation disturbance. Soil TOC, DOC, and MBC were significantly positive correlated with each other in the S. baicalensis steppe, but in the spring wheat field, the correlativity between DOC and TOC and that between DOC and MBC did not reach the significance level of 0.05.


Plant and Soil | 2011

Soil nitrous oxide emissions from a typical semiarid temperate steppe in inner Mongolia: effects of mineral nitrogen fertilizer levels and forms

Qin Peng; Yuchun Qi; Yunshe Dong; Shengsheng Xiao; Yating He


Environmental Earth Sciences | 2011

Effects of nitrogen fertilization on soil respiration in temperate grassland in Inner Mongolia, China

Qin Peng; Yunshe Dong; Yuchun Qi; Shengsheng Xiao; Yating He; Tao Ma


Clean-soil Air Water | 2013

Effects of Nitrogen Fertilization on Soil Microbial Biomass and Community Functional Diversity in Temperate Grassland in Inner Mongolia, China

Yating He; Yuchun Qi; Yunshe Dong; Shengsheng Xiao; Qin Peng; Xinchao Liu; Liangjie Sun


Soil & Tillage Research | 2015

Response of N2O emission to water and nitrogen addition in temperate typical steppe soil in Inner Mongolia, China

Xinchao Liu; Yunshe Dong; Yuchun Qi; Qin Peng; Yating He; Liangjie Sun; Junqiang Jia; Shufang Guo; Congcong Cao; Zhongqing Yan; Xuehua Liu


Soil & Tillage Research | 2018

Long-term fertilization increases soil organic carbon and alters its chemical composition in three wheat-maize cropping sites across central and south China

Yating He; Xinhua He; Minggang Xu; Wenju Zhang; Xueyun Yang; Shaomin Huang

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Yuchun Qi

Chinese Academy of Sciences

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Yunshe Dong

Chinese Academy of Sciences

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Qin Peng

Chinese Academy of Sciences

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Liangjie Sun

Chinese Academy of Sciences

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Xinchao Liu

Chinese Academy of Sciences

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Junqiang Jia

Chinese Academy of Sciences

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Congcong Cao

Chinese Academy of Sciences

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Shengsheng Xiao

Chinese Academy of Sciences

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Shufang Guo

Chinese Academy of Sciences

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Xinhua He

University of Western Australia

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