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标题：RELATIONSHIPS BETWEEN SOIL PHYSIOCHEMICAL PROPERTIES AND SOIL RESPIRATION UNDER DIFFERENT LAND USES IN AN ALPINE GRASSLAND DURING FREEZE-THAW PERIOD
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作者：Dongliang Han ; Pujia Yuz ; Xinping Zhu 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2018
卷号：27
期号：11
页码：7364-7373
语种：English
出版社：PSP Publishing
摘要：Soil respiration was hypothesized to have a special response pattern to soil physiochemical properties (SPP) and different land uses in the soil freeze-thaw period (FTP). SPP included soil environmental, soil quality, soil carbon (C), soil total and available nutrient. Land use treatments were longterm grazed grassland (GG), long-term ungrazed grassland since 1984 (UGII) and short-term conversion of grassland to farmland since 2014 (GF). The soil sampling sites (depth of 20 cm) were subsequently selected for monitoring of soil temperature, soil water content and of each land use treatments. The correlations with SPP at different land uses were identified with statistical analysis. Structural equation modeling (SEM) was performed to analyze hypothetical pathways that may explain the multivariate relationships between explanatory variables (e.g. SPP) and . This work analyses data came from soil FTP occurs regularly from April to May, 2017. On average, exhibited pronounced temporal variation with the highest value of 4.42 μ mol· m-2· s-1 at 14:00 pm in the GF site occurring soil thaw period and the lowest value of 0.44 μ mol· m-2· s-1 at 20:00 pm in the GG site occurring soil freeze period. The content in GG and GUII sites increased by 43.87% and 44.93% for soil organic carbon, by 65.65% and 70.18% for soil microbial biomass carbon and by 16.57% and 19.52% for soil total carbon, respectively, compared with GF site. SEM model observed that soil quality had a strong positive correlation with soil total nutrient (r=0.70, <0.001), and soil total nutrient (r=0.96, <0.001) had a strong positive correlation with soil C, whereas the soil C had a negative correlation on (r=-0.25, <0.01). To conclude, long-term ungrazed grassland can increase of plant biomass and contributed to the increases in soil nutrient result in increases of soil C content. More nutrient input, for instance, sheep manure and crop residues can be applied to the farmland to enhance the soil fertility and decrease of . This work also showed that soil quality can adjust soil nutrient seems to be especially important to changes.
关键词：Structural equation model;Field experiment;Short-term;Long-term