Distribution Characters of Soil Microbial in Wuzhi Part of Yellow River Riparian Wetland after Artificial Restoration

2012 ◽  
Vol 518-523 ◽  
pp. 5030-5034
Author(s):  
Ning Zhu ◽  
Tong Qian Zhao ◽  
Chun Yan Xiao ◽  
Li Heng Jiao ◽  
Kun Feng Zhang
Keyword(s):  
Yellow River ◽  
Typha Angustifolia ◽  
Distribution Characteristics ◽  
Phragmites Communis ◽  
Polygonum Hydropiper ◽  
Riparian Wetland ◽  
Soil Microbial ◽  
Bare Land ◽  
Before And After ◽  
Artificial Restoration

Abstract: This article describes the distribution characteristics of soil microbial in different vegetable types in artificial wetland restoration. The results show that quantity of microbial had a significant increase before and after restoration. The value of Polygonum hydropiper sample was largest. The sequence of increase was Polygonum hydropiper,Phragmites communis Trin,Typha angustifolia and bare land; Referring to the change of three types of microorganisms, bacteria enhance 2.16 times largest; Meanwhile fungi go up 1.11 times least. The range of microbial diversity value before restoration is 0.2437-0.7633, and after is 0.1163-0.4069;Bacteria amount had significant correlation with TN.

The Study on Agricultural Non-Point Nitrogen Pollution Control

2012 ◽  
Vol 573-574 ◽  
pp. 213-217
Author(s):  
Gui Lan Zhang
Keyword(s):  
Pollution Control ◽  
Yellow River ◽  
Control Function ◽  
Nitrogen Pollution ◽  
Natural State ◽  
Runoff Water ◽  
Riparian Wetland ◽  
Temporal And Spatial ◽  
Runoff Events

Purification effects of riparian wetland in a natural state on pollutants are unstable and are always influenced by hydrology, climate, and extent of wetlands development. For this reason, study of the role of the purification function of riparian wetland in a natural state is ongoing. In this study, with the Kouma section of the Yellow River wetlands as the study area, using the field experiment method and the 15N enriched technique, the agricultural non-point nitrogen pollution control function of Phragmites communis Trin in riparian wetlands was studied. Artificial runoff events enabled the collection of a temporal and spatial array of samples within the wetland so that the plume of runoff water moving through the wetland could be traced and its attenuation determined.

scholarly journals Reclamation of Cultivated Land Reserves in Northeast China: Indigenous Ecological Insecurity Underlying National Food Security

2020 ◽  
Vol 17 (4) ◽  
pp. 1211 ◽  
Author(s):  
Wenbo Li ◽  
Dongyan Wang ◽  
Shuhan Liu ◽  
Yuanli Zhu ◽  
Zhuoran Yan
Keyword(s):  
Food Security ◽  
Northeast China ◽  
Cultivated Land ◽  
Land Resources ◽  
Rapid Urbanization ◽  
Lower Productivity ◽  
Bare Land ◽  
Before And After ◽  
Induced Changes ◽  
Gains And Losses

The competition for land resources created by the need for food security and ecological security is intensifying globally. To resolve the issue of land scarcity in agriculture following rapid urbanization, China implemented its requisition–compensation balance policy of cultivated lands in 1997, the introduction of which consumed numerous areas of land, such as river shoal and bare land, through reclamation. Moreover, these reclaimed and newly cultivated lands were mainly distributed in the northern part of China. Most previous studies of this subject have only examined the overall balance of cultivated lands in well-developed regions, and there is a lack of knowledge about the indigenous gains and losses before and after reclamation in important areas such as northeast China. Therefore, this study selected two representative county-level units in northeast China as the study area to analyze the conversion of cultivated land reserves during 1996–2015, evaluate the performance of reclaimed cultivated lands in terms of quality and productivity and calculate reclamation-induced changes in ecosystem service value. The results indicated that by 2015 only 16.02% of the original cultivated land reserves remained unconverted; nearly 60% were reclaimed as cultivated lands and over 20% were converted to other land resources. River shoal and ruderal land were the primary resources for cultivated lands compensation, and marsh, bare land and saline-alkaline land were found to be converted the most thoroughly. The gain of 23018.55 ha reclaimed cultivated lands were of relatively inferior quality and lower productivity, contributing approximately 4.32% of total grain output. However, this modest gain was at the expense of a 768.03 million yuan ecosystem services loss, with regulating services and supporting services being undermined the most. We argue that even if northeast China continues to shoulder the responsibility of compensating for a majority of cultivated land losses, it still needs to carefully process reclamation and introduce practical measures to protect indigenous ecosystems, in order to better serve the local residents and ensure prolonged food security with sustainability.

scholarly journals Changes in streamflow and sediment discharge and the response to human activities in the middle reaches of the Yellow River

2010 ◽  
Vol 7 (5) ◽  
pp. 6793-6822 ◽  
Author(s):  
P. Gao ◽  
X.-M. Mu ◽  
F. Wang ◽  
R. Li
Keyword(s):  
Human Activities ◽  
Yellow River ◽  
The Yellow River ◽  
Human Intervention ◽  
Sediment Discharge ◽  
Annual Streamflow ◽  
Dominant Position ◽  
Before And After ◽  
Double Mass ◽  
Precipitation Changes

Abstract. The objectives of this work are: (a) to statistically test and quantify the decreasing trends of streamflow and sediment discharge in the middle reaches of the Yellow River in China during 1950–2008, (b) to identify change points or transition years of the decreasing trends, and (c) to diagnose whether the decreasing trends were caused by precipitation changes or human intervention, or both. The results show that significant decreasing trends in annual streamflow and sediment discharge have existed since the late 1950s in the middle reaches of the Yellow River (P=0.01). Change-point analyses further revealed that transition years existed and that abrupt decline in streamflow and sediment discharge began in 1985 and 1981, respectively, in the middle reaches of the Yellow River (P=0.05). Adoption of conservation measures in the 1980s and 1990s corroborates the identified transition years. Double-mass curves of precipitation vs. streamflow (sediment) for the periods before and after the transition year show remarkable decreases in proportionality of streamflow (sediment) generation. Compared with the period before the transition year, cumulative streamflow and cumulative sediment discharge reduced respectively by 17.8% and 28% during 1985–2008, which was caused by human intervention, in the middle reaches of the Yellow River. It is, therefore, concluded that human activities occupied a dominant position and played a major role in the streamflow and sediment discharge reduction in the middle reaches of the Yellow River.

scholarly journals Soil Microbial Community Based on PLFA Profiles in an Age Sequence of Pomegranate Plantation in the Middle Yellow River Floodplain

Diversity ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 408
Author(s):  
Shilin Wang ◽  
Xinyu Yan ◽  
Dong Wang ◽  
Imran Ahammad Siddique ◽  
Ji Chen ◽  
...  
Keyword(s):  
Microbial Community ◽  
Community Composition ◽  
Soil Microbial Community ◽  
Yellow River ◽  
Microbial Community Composition ◽  
Stand Age ◽  
Soil Microbial ◽  
Age Sequence ◽  
Soil Microbial Community Composition

Pomegranate (Punica granatum L.) is one of the most important fruit trees in semi-arid land. Previous studies were primarily focused on soil microbial community composition under different pomegranate plantation managements. However, soil microbial community composition under long-term pomegranate plantation has rarely been studied. We investigated pomegranate plantation along with an age sequence (i.e., 1, 3, 5, and 10 years after pomegranate plantation; abbreviated by P1, P3, P5, P10, respectively) in the Middle Yellow River floodplain. Our objectives were to address (1) variations of soil physicochemical properties and (2) changes in soil microbial community composition and the influential factors. The results demonstrated that the soil water content of pomegranate plantation decreased with the increase of pomegranate plantation stand age. Specifically, dissolved organic carbon, ammonium, and available phosphorus increased significantly with stand age both at 0–10- and 10–20-cm soil depths. The P10 had the highest microbial phospholipid fatty acid (PLFA) profiles, including fungi, bacteria, Gram-positive bacteria, Gram-negative bacteria, and arbuscular mycorrhizal fungi. The ratio of fungal PLFAs to bacterial PLFAs increased and the ratio of Gram-positive to Gram-negative bacterial PLFAs decreased along the pomegranate plantation stand age. Dissolved organic carbon was the most important influential factor among the studied variables, which explained 42.2% variation of soil microbial community. In summary, the long-term plantation of pomegranate elevated soil microbial biomass and altered microbial community composition.

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