Impact of environmental factors and biological soil crust types on soil respiration in a desert ecosystem.
Impact of environmental factors and biological soil crust types on soil respiration in a desert ecosystem.
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DOI：
10.1371/journal.pone.0102954
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Fa K
中科院分区：
文献类型：
--
作者：
Feng W;Zhang Y;Jia X;Wu B;Zha T;Qin S;Wang B;Shao C;Liu J;Fa K
土壤呼吸对环境条件的响应在不同的生态系统中得到了广泛的研究。然而，温度和湿度对生物结皮土壤呼吸的影响尚不清楚。本研究于2012年6月至10月在宁夏利用自动化室内系统连续测量了生物结壳土壤的CO2外排。地衣结壳土壤呼吸速率最高（0.93±0.43µmol m−2 s−1），藻类结壳土壤呼吸速率最低（0.73±0.31µmol m−2 s−1）。在日尺度上，土壤呼吸在早晨最高，而土壤温度在中午最高，两者之间存在日滞后。土壤呼吸与温度的滞后时间与土壤体积含水量呈负相关，随土壤含水量的增加而减小。在季节尺度上，当地衣结皮土壤湿度超过0.075 m3 m−3和苔藓结皮土壤湿度超过0.085 m3 m−3时，日平均夜间土壤呼吸与土壤温度呈正相关。然而，在研究期间，水分对藻壳土的土壤呼吸没有影响。以土壤温度归一化的夜间平均土壤呼吸随地衣和苔藓结皮土壤含水量的增加而增加。结果表明，不同类型的生物结皮会影响土壤呼吸对环境因子的响应。有必要考虑不同类型生物土壤结皮的空间分布及其在生态系统或景观水平上对总碳收支的相对贡献。
The responses of soil respiration to environmental conditions have been studied extensively in various ecosystems. However, little is known about the impacts of temperature and moisture on soils respiration under biological soil crusts. In this study, CO2 efflux from biologically-crusted soils was measured continuously with an automated chamber system in Ningxia, northwest China, from June to October 2012. The highest soil respiration was observed in lichen-crusted soil (0.93±0.43 µmol m−2 s−1) and the lowest values in algae-crusted soil (0.73±0.31 µmol m−2 s−1). Over the diurnal scale, soil respiration was highest in the morning whereas soil temperature was highest in the midday, which resulted in diurnal hysteresis between the two variables. In addition, the lag time between soil respiration and soil temperature was negatively correlated with the soil volumetric water content and was reduced as soil water content increased. Over the seasonal scale, daily mean nighttime soil respiration was positively correlated with soil temperature when moisture exceeded 0.075 and 0.085 m3 m−3 in lichen- and moss-crusted soil, respectively. However, moisture did not affect on soil respiration in algae-crusted soil during the study period. Daily mean nighttime soil respiration normalized by soil temperature increased with water content in lichen- and moss-crusted soil. Our results indicated that different types of biological soil crusts could affect response of soil respiration to environmental factors. There is a need to consider the spatial distribution of different types of biological soil crusts and their relative contributions to the total C budgets at the ecosystem or landscape level.
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影响因子：
3.7
作者：
Jia X;Zha T;Wu B;Zhang Y;Chen W;Wang X;Yu H;He G
通讯作者：
He G
影响因子：
3.7
作者：
Castillo-Monroy, Andrea P.;Maestre, Fernando T.;Garcia-Palacios, Pablo
通讯作者：
Garcia-Palacios, Pablo
影响因子：
3.7
作者：
Gao GL;Ding GD;Wu B;Zhang YQ;Qin SG;Zhao YY;Bao YF;Liu YD;Wan L;Deng JF
通讯作者：
Deng JF
影响因子：
64.8
作者：
Högberg, P;Nordgren, A;Read, DJ
通讯作者：
Read, DJ
影响因子：
6.2
作者：
Flechard, C. R.;Neftel, A.;Fuhrer, J.
通讯作者：
Fuhrer, J.