XU Ting,MA Lulu,LI Zesen,et al.Response of Soil Respiration to Changes of Rainfall Pattern in Naturally Restored Grassland in Loess Hilly Region[J].Research of Soil and Water Conservation,2023,30(05):92-98.[doi:10.13869/j.cnki.rswc.2023.05.004.]
黄土丘陵区自然恢复草地土壤呼吸对降雨格局改变的响应
- Title:
- Response of Soil Respiration to Changes of Rainfall Pattern in Naturally Restored Grassland in Loess Hilly Region
- 文章编号:
- 1005-3409(2023)05-0092-07
- 分类号:
- X171
- 文献标志码:
- A
- 摘要:
- [目的]揭示黄土丘陵区自然恢复草地土壤呼吸对长期改变降雨的响应情况,并阐明不同降雨处理土壤呼吸与土壤温度、土壤含水量的关系。[方法]以黄土丘陵区自然恢复草地群落为对象,进行长期野外人工控制降雨试验,设置增雨20%,40%,60%以及减雨20%,40%,60%和对照处理,测定土壤呼吸、土壤温度、土壤含水量。[结果]不同降雨处理土壤呼吸在生长季呈单峰曲线,7月达最大值,10月达最小值; 在整个生长季内,增雨20%、增雨60%对土壤呼吸无显著促进作用,增雨40%及减雨20%,40%,60%显著降低土壤呼吸(p<0.05),表现为土壤呼吸随降雨量的增加而降低。生长季内,降雨显著影响土壤含水量(p<0.05),土壤含水量随雨量减少而减少; 与对照相比除减雨60%处理外,其余降雨处理显著降低了土壤温度(p<0.05)。无水分胁迫条件下,不同降雨处理土壤温度与土壤呼吸均呈极显著指数相关(p<0.01); 各降雨处理土壤含水量与土壤呼吸均呈显著二次函数相关(p<0.05); 土壤温度、土壤含水量双因素与土壤呼吸呈极显著的线性、幂—指数相关,且双因素幂—指数模型最优。[结论]总体上,降雨对黄土丘陵区自然恢复草地群落土壤呼吸的影响受土壤温度与土壤含水量联合调控,其主导程度取决于是否发生水分胁迫。
- Abstract:
- [Objective] The response of soil respiration to long-term change of rainfall in naturally restored grassland in the loess hilly region was revealed, and the relationship between soil respiration and soil temperature and soil water content under different rainfall treatments was expounded. [Methods] The natural restoration of grassland communities in the loess hilly area was taken as the object. Long-term field artificially controlled rainfall experiment on setting 20%, 40%, 60% rain increase and 20%, 40%, 60% rain reduction and control treatments was conducted. Soil respiration, soil temperature, and soil water content were measured. [Results](1)Soil respiration under different rainfall treatments showed a unimodal curve in the growing season, reaching a maximum value in July and a minimum value in October. In the whole growing season, the increase of rainfall by 20% and the increase of rainfall by 60% had no significant effect on soil respiration. 40% increase in rainfall and 20%, 40% and 60% decrease in rainfall significantly inhibited soil respiration(p<0.05), which showed that soil respiration decreased with the increase of rainfall.(2)In the growing season, rainfall significantly affected soil water content(p<0.05), which decreased with the decrease of rainfall. Except for 60% decrease in rainfall treatment, the other rainfall treatments significantly decreased soil temperature(p<0.05).(3)Under the condition of no water stress, soil temperature and soil respiration in different rainfall treatments showed extremely significant exponential correlation(p<0.01). Soil water content and soil respiration in each rainfall treatment showed significant quadratic function correlation(p<0.05). The two factors of soil temperature and soil water content had the very significant linear and power-exponential correlation with soil respiration, repcectively, and the two-factor power-exponential model was optimal. [Conclusion] In general, the effect of rainfall on the soil respiration of the naturally restored grassland community in the loess hilly area is jointly regulated by soil temperature and soil water content, and its dominant degree depends on whether water stress occurs.
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备注/Memo
收稿日期:2022-07-15 修回日期:2022-08-28
资助项目:国家自然科学基金面上项目“黄土丘陵区土壤斥水性及其对降水入渗机制的影响研究”(41977426)
第一作者:徐婷(1997—),女,重庆市璧山人,硕士研究生,主要从事黄土丘陵区土壤水分入渗的研究。E-mail:Tiana_xuting@163.com
通信作者:焦峰(1967—),男,陕西省三原县人,博士,研究员,主要从事水土保持环境效应评价方面的研究工作。E-mail:Jiaof@ms.iswc.ac.cn