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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Characteristics of carbon flux in two biologically crusted soils in the Gurbantunggut Desert, Northwestern China.
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Characteristics of carbon flux in two biologically crusted soils in the Gurbantunggut Desert, Northwestern China.

机译：西北古尔班通古特沙漠中两种生物结皮土壤的碳通量特征。

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摘要

Different from soils in other ecosystems, soils in arid and semiarid areas are covered by biological soil crusts, which can both assimilate and release carbon via their physiological activities. Nevertheless, few studies have evaluated carbon flux in biologically crusted soils. In the current study, we investigated the daily carbon flux in moss- and cyanobacterial/lichen-crusted soils, as well as crust-removed soil (referred as bareland) in the Gurbantunggut Desert, Northwestern China from April to October 2010. We also investigated carbon flux in biologically crusted soils after 0, 2, 5, and 15 mm precipitation treatments. Carbon flux between crusted soil and bareland had no significant difference, with average values of 0.16, 0.2, and 0.12 micro mol m-2 s-1 for moss-crusted soil, cyanobacterial/lichen crusted soil, and bareland, respectively. The corresponding Q10 values for the three soils were 2.9, 3.5, and 1.9, respectively. Precipitation significantly elicited carbon flux, reaching a maximum value of 2.4 micro mol m-2 s-1. After precipitation, the net carbon flux in light was lower than that in dark respiration. No carbon influx was observed in light condition. The average carbon flux rate and total carbon production increased exponentially with the precipitation amount. This study indicates that biological soil crusts do not increase the respiration of soil, but increases the temperature dependence of soil carbon flux because of the higher microbial biomass than bareland.
机译：与其他生态系统中的土壤不同，干旱和半干旱地区的土壤被生物土壤结皮覆盖，生物结皮可以通过其生理活动吸收和释放碳。然而，很少有研究评估生物结皮土壤中的碳通量。在当前的研究中，我们调查了2010年4月至10月中国西北部古尔班通古特沙漠中苔藓和蓝细菌/地衣硬皮土壤以及脱壳的土壤（称为无土）的每日碳通量。 0、2、5和15 mm沉淀处理后生物结皮土壤中的碳通量。结壳土壤与荒地之间的碳通量无显着差异，苔藓土壤的碳通量平均值为0.16、0.2和0.12 micro mol m -2 s -1 ，蓝藻/地衣结s的土壤和荒地。这三种土壤的相应 Q 10 值分别为2.9、3.5和1.9。降水显着引起碳通量，最大值达到2.4 micro mol m -2 s -1 。沉淀后，光照下的净碳通量低于黑暗呼吸下的净碳通量。在光照条件下未观察到碳流入。平均碳通量率和总碳产量随降水量呈指数增长。这项研究表明，生物微生物结皮不会增加土壤的呼吸作用，但是会增加土壤碳通量的温度依赖性，因为微生物的生物量高于光地。

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