Effects of Stocking Rates and Simulated Precipitation on Soil Respiration in a Stipa breviflora Desert Steppe, Inner Mongolia, China

IF 1.4 4区农林科学 Q4 SOIL SCIENCE Eurasian Soil Science Pub Date : 2024-01-31 DOI:10.1134/s1064229323602718

Yuanyuan Cui, Xiaohui Song, Liu Bai, Zhongwu Wang

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Abstract

The subject of this study was to understand how grazing and precipitation affect the carbon cycle of grassland ecosystem. The experiment was carried out in a desert steppe of Siziwang Banner, Inner Mongolia, China, and measured CO₂ flux and abiotic factors twice a month during the growing season (July to October in 2016, May to October in 2017). The experiment used a completely randomized block design, involving four different stocking rate treatments [CK, no grazing, (0 sheep unit hm ^–2 half year^–1), light stocking rate (LG, 0.93 sheep unit hm^–2 half year^–1), moderate stocking rate (MG, 1.82 sheep unit hm^–2 half year^–1) and heavy stocking rate (HG, 2.71 sheep unit hm^–2 half year^–1)] with three replicates, and four precipitation treatments [50% reduced precipitation (P1), natural precipitation (P2), 50% increased precipitation (P3) and 100% increased precipitation (P4)] were set up in each stocking rate treatment plot. Results indicated that increased precipitation treatments significantly increased soil water content (SWC) and soil respiration (Rs), and significantly reduced soil temperature (Ts), grazing treatments significantly reduced Ts, the interaction between precipitation and stocking rate had no significant impact on the above indicators; Rs increased with increasing precipitation in the order: P4 > P3 > P2 > P1, Rs exhibited the following order under different stocking rates: CK > LG > MG > HG. There was a strong positive correlation between Rs and SWC, and a negative relationship between Rs and Ts. Our results demonstrate that SWC is the dominant factor affecting Rs, as SWC explained 87.12% of the variation in Rs.

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放养率和模拟降水对中国内蒙古沙漠草原土壤呼吸作用的影响

摘要本研究旨在了解放牧和降水如何影响草原生态系统的碳循环。实验在中国内蒙古四子王旗的荒漠草原上进行，在生长季节（2016年7月至10月，2017年5月至10月）每月测量两次二氧化碳通量和非生物因子。试验采用完全随机区组设计，包括四种不同的放养率处理[CK，无放牧，（0 羊单位 hm -2 半年-1）；轻度放养率（LG，0.93 羊单位 hm -2 半年-1）；中度放养率（MG，1.82 羊单位 hm -2 半年-1）和重度放养率（HG，2.71 羊单位 hm -2 半年-1）]。每个放养率处理小区设置四个降水量处理[降水量减少 50%（P1）、自然降水（P2）、降水量增加 50%（P3）和降水量增加 100%（P4）]，每个处理小区设三个重复。结果表明，增加降水量处理显著增加了土壤含水量（SWC）和土壤呼吸作用（Rs），显著降低了土壤温度（Ts），放牧处理显著降低了土壤温度（Ts），降水量与放养率之间的交互作用对上述指标无显著影响；Rs随降水量的增加而增加，顺序为Rs随着降水量的增加依次为：P4 > P3 > P2 > P1，Rs在不同放牧率下表现出以下顺序：CK > LG > MG > HG。Rs 与 SWC 之间存在很强的正相关性，而 Rs 与 Ts 之间存在负相关。我们的研究结果表明，SWC 是影响 Rs 的主要因素，SWC 解释了 Rs 变化的 87.12%。

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来源期刊

Eurasian Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

35.70%

发文量

137

审稿时长

12-24 weeks

期刊介绍： Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences. Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.