Effects of water and nitrogen control on soil meso- and micro-fauna communities in desert steppe
YE He1, HONG Mei1,2, ZHAO Bayinnamula1,2, HUO Li-xia1, GAO Hai-yan1
1. College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010011, China;
2. Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resoures, Huhhot 010011, China
An experiment with split-plot design which is water treatment as (3 levels:natural rainfall, increasing 30% of rainfall, and decreasing 30% of rainfall) main treatment and nitrogen treatments(4 nitrogen levels:0(N0), 30(N30), 50(N50) and 100(N100)kg/(hm2·a) as sub-region in Stipa breviflora desert steppe, was conducted to understand the effects of simulated nitrogen deposition and rainfall changes on soil meso- and micro-fauna communities. Our results showed that soil fauna individual density in the surface soil was increased at first and then was decreased with nitrogen concentration increase in same water treatment.Soil meso- and micro-fauna communities individual density in W-N30 treatment was significantly higher than that in other treatments (P<0.05), and group number decreased with nitrogen concentration. Rainfall reduction and excessive nitrogen application decreased the individual density of soil meso- and micro-fauna communities in the surface soil. Soil meso- and micro-fauna individual of the surface in Stipa breviflora desert steppe was significantly higher than that of subsurface soil. In addition, redundant analysis (RDA) showed the most obvious responsive to environmental factors soil fauna was the dominant and common groups in the study area.Soil meso- and micro-fauna communities individual density, rather than group number, was greatly influenced by soil pH, temperature, water content, organic matter and total C, total N and C/N ratio in short period. Soil fauna individual density in surface soil increased with nitrogen deposition increased under future projected climate change. However, soil fauna communities in surface soil were restricted when nitrogen reached threshold under different conditions.
叶贺, 红梅, 赵巴音那木拉, 霍利霞, 高海燕. 水氮控制对荒漠草原中小型土壤动物的影响[J]. 中国环境科学, 2018, 38(11): 4325-4333.
YE He, HONG Mei, ZHAO Bayinnamula, HUO Li-xia, GAO Hai-yan. Effects of water and nitrogen control on soil meso- and micro-fauna communities in desert steppe. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(11): 4325-4333.
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