Xianguo Lv

The peatlands developing history in the Sanjiang Plain, NE China, and its response to East Asian monsoon variation

Studying the peatlands accumulation and carbon (C) storage in monsoonal areas could provide useful insights into the response of C dynamics to climate variation in the geological past. Here, we integrated 40 well-dated peat/lake sediment cores to reveal the peatlands evolution history in the Sanjiang Plain and examine its links to East Asian monsoon variations during the Holocene. The results show that 80% peatlands in the Sanjiang Plain initiated after 4.7u2009ka (1 kau2009=u20091000 cal yr BP), with the largest initiating frequency around 4.5u2009ka. The mean C accumulation rate of peatlands in the Sanjiang Plain exhibits a synchronous increase with the peatlands expansion during the Holocene. Such a peatlands expanding and C accumulating pattern corresponds well to the remarkable drying event subsequent to the Holocene monsoon maximum. We suggest that in addition to the locally topographic conditions, Holocene variations of East Asian summer monsoon (especially its associated precipitation) have played a critical role in driving the peatlands initiation and expansion in the Sanjiang Plain.

Non-use value trends analysis of wetland ecosystem in the Sanjiang Plain, Northeast China

The total economic value of wetland ecosystem services can be separated into use value and non-use value. The non-use value assessment on a large time scale is insignificant for the wetland management policies. This paper uses an economic model to analyze the non-use value trends based on the former willingness to pay survey of the non-use value in the Sanjiang Plain. The assessment results show that under the combined effect of the discount rate and the change of relative price, the curve of the non-use value displays a gradually rising at first and then declining trend. The non-use value curve reaches a maximum after 42xa0years when the non-use value is

Function, restoration, and ecosystem services of riverine wetlands in the temperate zone

55.01 and the remaining wetland areas is 56.35xa0% of the situation in 2007. The elasticity of marginal utility of consumption and the elasticity of substitution substantially affect the assessment results. As they become larger, the combined effect of the discount rate and the change of relative price becomes larger too. This will result in a relative lower result of the non-use value assessment and minor supports for today measures of the wetland ecosystem conversation. Speeding up the recovery rate of wetland ecosystem is in favor of bringing down the costs of wetlands conservation, and if the wetland ecosystem in the Sanjiang Plain enter into a healthy state, people will not have to worry about whether or not others or future generations have the opportunity to use it in the future.

Evapotranspiration partitioning using a simple isotope‐based model in a semiarid marsh wetland in northeastern China

Abstract In this special issue, a number of the latest and meaningful research related to riverine wetlands from a variety of fields were presented and discussed, covering investigation and analysis of many studying sites, development of ecosystem service evaluation approaches, propose of ecosystems modeling methods, advancement of wetland restoration and protection techniques and strategies, as well as the applications of these methods and models in several typical wetlands and the associated river systems. In this special issue, 24 papers were selected for a thorough peer review process with at least two rounds of reviews. According to the journal’s guideline and requirement, the 24 papers were reviewed by at least two authoritative experts in this field. All papers were related to the topic of “Function, Restoration, and Ecosystem Services of Riverine Wetlands in the Temperate Zone,” offering a good view of relevant issues and research status, techniques, and applications for restoration. The 24 papers can be categorized into four groups: (a) investigation and evaluation of ecosystem services and functions, (b) dynamic modeling and optimal management of ecosystem services, (c) policies and technologies for ecosystem restoration, and (d) practices and application of ecosystems modeling and restoration approaches.

The influence of reclamation on the vertical distribution of soil organic carbon content in Calamagrostis angustifolia wetland

Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Street, Changchun 130102, China School of Biotechnology and Food Engineering, Changshu Institute of Technology, 99 South Three Ring Road, Changshu 215500, China Correspondence Wenguang Zhang, Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Street, Changchun, 130102, China. Email: zhangwenguang@iga.ac.cn Funding information National Science Foundation of China, Grant/ Award Number: NSFC41101091, NSFC41371193,NSFC 41471080 and NSFC NSFC41301606, NSFC41471080, NSFC41371193, NSFC41575129 and NSFC41101091; Science Foundation of Jilin Province, Grant/Award Number: 20150101080JC

Effect of nanocrystallization on tribological behaviors of ingot iron

To investigate how reclamation impacts the vertical distribution of SOC (soil organic carbon) content in soil profile of C. angustifolia wetland, 90 soil samples were sampled in 10 cm interval (0–100 cm depth) in C. angustifolia wetland, soybean and paddy field. The soybean and paddy field were reclaimed from C. angustifolia wetland. All these three sites have meadow albic soil. The results showed that wetland reclamation reduced the SOC content at all 10 soil layers within 100 cm depth soil profile. Difference in SOC contents between wetland and farmland was significant at 0–30 cm and 60–100 cm soil layers, but not significant at 30–60 cm soil layers. Compared with soybean field, the SOC content in upper 20 cm soil layers was more homogeneous in paddy field. Though wetland reclamation reduced the SOC content, it hasnt changed the regularity of SOC vertical distribution. The changes of SOC content with soil depth in C. angustifolia wetland, soybean and paddy field all can be described by specific exponential function. Which are useful to estimate and predict the regional SOC pool by models.