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Effects of Warming and Increased Precipitation on Root Production and Turnover of Stipa breviflora Community in Desert Steppe

文献类型： 外文期刊

作者： Li, Qi 1 ; Guo, Jianying 1 ; Wang, Zhanyi 2 ; Wang, Chengjie 2 ; Liu, Pengbo 3 ; Lv, Guangyi 2 ; Yang, Zhenqi 1 ; Wang, Chunjie 4 ; Qiu, Xiao 5 ;

作者机构： 1.China Inst Water Resources & Hydropower Res, Yinshanbeilu Grassland Ecohydrol Natl Observat & R, Beijing 100038, Peoples R China

2.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm, Minist Educ, Key Lab Grassland Resources, Hohhot 010018, Peoples R China

3.Arong Banner Forestry & Grassland Bur, Arong Banner 162750, Peoples R China

4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

5.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot 010031, Peoples R China

关键词： climatic change; root standing crop; Stipa breviflora community; aboveground net primary productivity; root turnover rate

期刊名称：AGRONOMY-BASEL （ 影响因子：3.3； 五年影响因子：3.7 ）

ISSN：

年卷期： 2024 年 14 卷 7 期

页码：

收录情况： SCI

摘要： Organic carbon in grassland mainly exists in the soil, and root production and turnover play important roles in carbon input into the soil. However, the effects of climate change on plant root dynamics in desert steppe are unknown. We conducted an experiment in a desert steppe, which included ambient temperature (T0); temperature increased by 2 degrees C (T1); temperature increased by 4 degrees C (T2); natural precipitation (P0); precipitation increased by 25% (P1); precipitation increased by 50% (P2); and the interaction between warming and increased precipitation. Plant community aboveground characteristics; root production; and root turnover were measured. We found that the root length production of the T0P2; T1P1; T2P0; and T2P1 treatments were significantly higher than that of the T0P0 treatment, with an increment of 98.70%, 11.72%, 163.03%, and 85.14%, respectively. Three treatments with temperature increased by 2 degrees C (T1P0; T1P1; and T1P2) and significantly increased root turnover rate compared to the T0P0 treatment, with increases of 62.53%, 42.57%, and 35.55%, respectively. The interaction between warming and increased precipitation significantly affected the root production of the community (p < 0.01), but this interaction was non-additive. Future climate warming will benefit the accumulation of root-derived carbon in desert steppe communities.

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