摘要
利用地统计学方法研究了民勤绿洲湖区表层土壤养分碱解氮、速效磷和速效钾的空间异质性。结果表明:绿洲、过渡带和荒漠三种景观下表层土壤中氮磷钾含量都呈现出"丰氮、富钾、贫磷"的特征;碱解氮与速效磷的变异系数在绿洲区最小,荒漠区最大,而速效钾在荒漠区最小,过渡带最大,但都属于中等变异;从绿洲到荒漠,碱解氮、速效磷呈U型分布特征,而速效钾为倒U型分布特征。碱解氮的最佳拟合模型为Exponential,速效磷为PentaspHerical,速效钾为Tetrasherical;氮和磷的富集区位于绿洲区,而速效钾在过渡带上出现富集中心。土壤的养分元素含量除了与成土母质的元素有关外,人类活动的影响也是非常重要的因素。
By using the methods of geostatistics, the spatial heterogeneity of available N, available P and available K in surface soils in Minqin lake area was studied. The results indicated that soil N and K were rich but soil P was poor over the three landscapes of oasis, desert and transitional belt. The variation coefficient of soil available N and P was the smallest in oasis area and the biggest in desert area, while that of soil available K was the smallest in desert area and the biggest in oasis-desert transitional belt. Soil nutrients in the study area wholly exhibited moderate spatial variability. The soil available N and P presented a U-shaped distribution pattern, and the soil available K presented an inverse U-shaped distribution pattern from oasis to desert. Available N, P and K fitted well to Exponential model, PentaspHerical model and Tetrasherieal model, respectively. The enriched zone of available N and P was located in oasis area, whereas that of available K was located in oasis - desert transitional belt. The soil nutrient contents were related not only to the elements of parent rocks, but also to the impact of human activities.
出处
《干旱地区农业研究》
CSCD
北大核心
2013年第1期127-132,共6页
Agricultural Research in the Arid Areas
基金
甘肃省自然科学基金项目(3ZS061-A25-009)
国家公益性行业(气象)科研专项(GYHY200806021,GYHY201106029)
干旱气象科学研究基金项目(IAM201206)
甘肃省气象局第二批”青年优秀人才”基金
关键词
表层土壤
养分
空间异质性
地统计学
民勤湖区
surface soil
nutrient
spatial heterogeneity
geostatistics
Minqin lake area
