1. 高寒沼泽草甸土壤养分特征及影响因素分析.
- Author
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许泰 and 鄂崇毅
- Subjects
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FOOTHILLS , *SWAMPS , *MEADOWS , *STOICHIOMETRY , *SOILS - Abstract
[Objective] Soil organic carbon (SOC) and nutrient content are not only the key indicators of soil quality health evaluation, but also the limiting factors for the sustainable development of alpine and high altitude ecosystems in the plateau. The present paper aimed to explore the current status and influencing factors of soil surface nutrients in alpine swamp meadow, and to determine the fertilizer supply capacity of the soil type. [Method) Taking the alpine swamp meadow soil at the southern foot of the Qilian Mountains as the research object, and referring to the China Second Soil Census Nutrient Grading Standard, selecting pH, organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), total potassium (TK), available nitrogen (AN), available phosphorus (AP), available potassium (AK) for the depth of 0-10 and 0-20 cm soil carbon, nitrogen, phosphorus, potassium content and ecological stoichiometric characteristics were analyzed. [Result] The soil layers with 0-10 cm content of organic carbon (SOC), total nitrogen (TN), available nitrogen (AN), available phosphorus (AP) and available potassium (AK) higher than 10-20 cm, pH, total phosphorus (TP) content did not change significantly, total potassium (TK) content increased slightly. The ecological stoichiometric characteristics showed that the C/P and N/P of the 0-10 cm soil layer were higher than 10-20 cm, and the N/P was lower than that 10-20 cm soil layer. On the whole, the pH of the alpine swamp meadow soil was neutral-weakly acidic, and the rank sequence of soil nutrient content was organic carbon (SOC) total nitrogen (TN) ≈ available nitrogen (AN) > total phosphorus (TP) > total potassium (TK) > available potassium (AK) > available phosphorus (AP). The organic carbon (SOC), total nitrogen (TN) and available nitrogen (AN) were at the first level, belonging to the rich level; Total phosphorus (TP) was at the second level, belonging to the relatively rich level; Total potassium (TK) was at the third level, belonging to the middle level; Available potassium (AK) was at the fourth level, belonging to the relatively lack level; Available phosphorus (AP) was at the sixth level, belonging to the exigence level. [Conclusion] The decomposition and mineralization rate of organic matter in the 0-20 cm soil layer of alpine swamp meadow in the southern foot of Qilian Mountains is slow, organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) are abundant, and N and Pavailability is low. The research results provide references for soil health, quality evaluation and ecological restoration in the alpine region of the Qinghai-Tibet Plateau. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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