摘要
研究黄土高原地区撂荒地土壤全磷的空间变异，可为该地区植被自然恢复措施的持续实施提供理论指导。本文通过2m×2m小网格布置了49个采样点，利用经典统计和地统计学方法研究分析了地面以下4个深度土壤全磷的空间异质性规律。结果表明：（1）表层（0—10era）全磷含量水平为0．44gkg～，显著高于其它3个深度，且土壤全磷在每个深度层均为中等程度变异；（2）土壤全磷含量水平与其方差的正相关关系在土壤表层最显著（P〈0．05）；（3）土壤全磷在0～10cm和30～40cm深度范围呈现中等空间依赖性，在10-20cm与20～30cm呈现强烈空间依赖性；（4）土壤全磷在各深度的空间分布插值图显示，表层土壤全磷的空间分布与下层差异较大，10～20Gm与20～30cm土壤全磷的空间分布具有高度的相似性。
Knowledge of the spatial variability of soil total phosphorus in fallow on the northern Loess Plateau can help to guide the continuous practices of natural vegetation restoration. This paper studied the micro-scale spatial variability of soil total phosphorus through 2 m ~ 2 m grids and 49 sampling points across a fallow. Both classical statistics and geo-statistics were employed. Results showed that： （1） The mean content of 0.44 g kg-1 at surface layer （0 - 10 cm） was significantly higher than those at other three layers. Soil total phosphorus had moderate variability at four investigated depths, and （2） The positive effects of total phosphorus level on its variability was the strongest at 0 - 10 cm layer; （3） Two theoretical models, spherical and exponential, were fitted for semi-variance of soil total phosphorus. The models for depths of 0 - 10 cm and 30 - 40 cm performed well, where soil total phosphorus had moderate spatial dependence. Strong spatial dependence were observed at layers of 10 - 20 cm and 20 - 30 cm. （4） Interpolation contour maps indicated soil total phosphorus at surface layer was very different from those at other depths. The spatial pattern of soil total phosphorus between 10 - 20 cm and 20 - 30 cm were highly similar.
出处
《土壤通报》
CAS
CSCD
北大核心
2014年第1期116-122,共7页
Chinese Journal of Soil Science
基金
教育部创新团队项目"黄土高原流域生态系统中水土迁移机制及其调控机理"(IRT0749)
国家自然科学基金项目"土壤水分植被承载力模拟研究"(E090103)资助
关键词
退耕地
自然恢复
土壤养分
半方差函数
Box—Cox转换
Abandoned farmland
Natural restoration
Soil nutrient
Semi-variance function
Box-Cox transformation
