广西植物Issue(4)：467-472,449,7.DOI:10.3969/j.issn.1000-3142.2014.04.007
青藏高原高寒草甸不同季节土壤理化性质及酶活性对施肥处理的响应
Tibetan Plateau alpine meadow soil properties and enzyme activity in response to fertilization gradients in different seasons
摘要
Abstract
Different fertilization gradients affect to the soil total nutrient,available nutrients,pH,water content,organ-ic carbon and soil urease activity in alpine meadow in Maqu area were studied.To reveal the alpine meadow soil nutri-ent and enzyme activity in response to fertilization gradients.The results were as follows:(1)With the increase of fer-tilization gradients,soil pH tended to reduce obviously,fertilizing caused soil acidification in grassland ecosystem,total phosphorus and rapid available phosphorus increased obviously as the increase of fertilization gradients;(2)Soil total nitrogen,organic carbon and urease activity changed as a single peak curve as the increase of fertilization gradients.It was higher in the fertilizer gradients of 30 or 60 gm-2 ,and the soil resources gradually reduced in the fertilizer gradi-ent of 90 gm-2 ;(3)Seasonal variation had a certain influence on soil nutrients,total nitrogen and total phosphorus content were higher in September,The available nitrogen content was generally lower in September,available phos-phorus was lower in May;(4)The influence of fertilizer application on soil nutrients was not simple linear positive correlation.The fertilization gradients of 30-60 gm-2 could be used as the best fertilizer levels in alpine meadow. Soil organic carbon and urease activity could be used as the important indicators to measuring soil fertilizer and soil quality in fertilization gradients.High rate of fertilization (≥90 gm-2 )can be regarded as the threshold to effect the structure and function in alpine meadow,soil nutrient and soil enzyme activity.关键词
青藏高原/高寒草甸/施肥梯度/土壤理化性质/土壤酶活性Key words
Tibetan Plateau/alpine meadow/fertilization gradients/soil properties/soil enzyme activity分类
农业科技引用本文复制引用
李恩宇,何贵永..青藏高原高寒草甸不同季节土壤理化性质及酶活性对施肥处理的响应[J].广西植物,2014,(4):467-472,449,7.基金项目
国家自然科学基金面上项目(41171214) （41171214）
国家自然科学基金(41171046) （41171046）
