降雨频率对甘南尕海湿草甸土壤碳氮磷化学计量特征的影响

Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Soil Science submitted time 2023-08-25 Cooperative journals: 《干旱区研究》

关宇淇1 李广1 潘雪2 徐国荣1 魏星星3 刘昊1 吴江琪1

Abstract： Rainfall is an important factor affecting water supply and soil respiration in wetland areas. Increases inextreme rainfall variability caused by global climate change are thus expected to impact wetland ecosystems. Toinvestigate this, the changes in soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) inresponse to altered rainfall frequencies (weekly, fortnightly, three- weekly, four- weekly, and control irrigationtreatments) were assessed in a wet meadow in the Gahai-Zecha Nature Reserve on the north-eastern edge of theTibetan Plateau. The SOC was found to increase with increasing rainfall frequency, while TP and TN decreased.SOC and TN decreased with increasing soil depth and TP was inconsistent across the different soil layers. As aresult, the ratios of C:P and N:P decreased with the soil layers, but the ratio of C:N did not show a significantchange. The ratios of C:N, C:P, and N:P did not show significant responses to the rainfall treatments. The SOC,TN, and TP showed obvious seasonal variations, as the SOC showed an increasing and then decreasing trend, theTN showed a decreasing and then increasing trend, and the TP content showed an“M”-shaped decreasing trend.The results suggest that continuous changes in global rainfall, including an increased rainfall frequency, willaggravate the loss of nitrogen and phosphorus in the shallow soil of the alpine wet meadow, likely resulting inaggravated damage due to eutrophication in the water environment surrounding the alpine wet meadows.

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