Effects of snow addition on soil phosphorus availability in an alpine meadow of the Tibetan Plateau

doi:10.11686/cyxb2023328

Abstract

Abstract:

Deeper snow cover in winter may change soil phosphorus cycling in alpine meadow grassland ecosystems through effects on soil temperature and moisture. A field experiment involving snow addition was conducted at an alpine meadow in the permafrost region of the Tibetan Plateau. Snow fences were used to contain snow to simulate increased depth of snow cover. The results showed： 1） Snow addition significantly increased temperature and moisture in the top 0-10 cm soil horizon in the growing season （from May to September）. 2） Snow addition significantly increased soil total phosphorus， available phosphorus and Al-P in the 0-10 cm and 10-20 cm soil horizons， but decreased soil organic phosphorus and Ca₂-P contents. The Ca₈-P content decreased in the 0-10 cm soil depth and increased in the 10-20 cm soil depth. 3） Redundancy analysis showed that the key factors affecting soil phosphorus forms were soil total nitrogen， organic matter and soil hydrothermal state. Therefore， it was confirmed that snow addition improved soil organic phosphate mineralization rate by changing soil physical and chemical properties， including total nitrogen content， organic matter content， hydrothermal state and soil phosphatase activity. Snow addition also promoted phosphorus release from slow-acting phosphorus sources such as Ca₈-P and Al-P， and improved soil phosphorus availability.

Key words: Qinghai-Tibet Plateau, snow addition, alpine meadow, phosphorus availability

Xiang-jiao TAN, Kui-cai DONG, Hua ZHANG, Chuan-chuan TANG, Yan YANG. Effects of snow addition on soil phosphorus availability in an alpine meadow of the Tibetan Plateau[J]. Acta Prataculturae Sinica, 2024, 33(7): 205-214.

Figures/Tables 6

References 58

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环境因子 Environmental factors	有效磷 Available phosphorus	全磷 Total phosphorus	有机磷 Organic phosphorus	Ca₂-P	Ca₈-P	Al-P	Fe-P	O-P	Ca₁₀-P
温度Temperature	0.033	0.218	-0.621*	0.575	-0.735**	0.401	0.136	0.564	0.371
水分Water content	0.167	-0.085	-0.143	-0.405	-0.002	-0.336	0.090	0.083	0.276
磷酸酶活性Soil phosphatase activity	0.025	0.076	-0.418	0.560	-0.842**	0.360	0.361	0.633*	0.491
有机质Soil organic matter	0.143	0.248	-0.378	0.483	-0.727**	0.536	0.855**	0.802**	0.564
全氮Total nitrogen	0.190	0.263	-0.391	0.441	-0.713**	0.547	0.861**	0.822**	0.595*
碱解氮Alkali nitrogen	0.352	-0.040	-0.249	0.041	-0.521	0.227	0.749**	0.628*	0.609*

环境因子 Environmental factors	有效磷 Available phosphorus	全磷 Total phosphorus	有机磷 Organic phosphorus	Ca₂-P	Ca₈-P	Al-P	Fe-P	O-P	Ca₁₀-P
温度Temperature	0.033	0.218	-0.621*	0.575	-0.735**	0.401	0.136	0.564	0.371
水分Water content	0.167	-0.085	-0.143	-0.405	-0.002	-0.336	0.090	0.083	0.276
磷酸酶活性Soil phosphatase activity	0.025	0.076	-0.418	0.560	-0.842**	0.360	0.361	0.633*	0.491
有机质Soil organic matter	0.143	0.248	-0.378	0.483	-0.727**	0.536	0.855**	0.802**	0.564
全氮Total nitrogen	0.190	0.263	-0.391	0.441	-0.713**	0.547	0.861**	0.822**	0.595*
碱解氮Alkali nitrogen	0.352	-0.040	-0.249	0.041	-0.521	0.227	0.749**	0.628*	0.609*

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