摘要
采用地统计相关原理分析了天目山国家级自然保护区常绿阔叶林土壤有机质、全氮、碱解氮、有效磷和速效钾的空间异质特征。研究发现：①土壤有机质具有较强的空间自相关性,而碱解氮、全氮和有效磷空间自相关为中等程度;速效钾在不同的步长和间距范围下,揭示其空间变异特征的模型不同,其空间变异比较复杂,在不同尺度下空间格局存在差异;②决定土壤养分空间格局的尺度以碱解氮最大,为4.21~169.50 m,而有效磷的空间异质性尺度最小,为4.21~50.20 m;③分形维数大小定量反映了不同营养成分空间格局差异及尺度依赖特征,速效钾分形维数较大,尺度依赖性强,空间格局复杂;有机质分形维数最小,空间相对简单;全氮、有效磷、碱解氮分形维数相差不大,其空间分布格局类似,但分形维数的细微变化也揭示了空间格局的在局部范围上的差异。
Spatial heterogeneity of soil nutrients is an important factor which affects the spatial distribution of vegetation.In this paper,geostatistical theory was used to analyze the spatial heterogeneity of soil nutrients including soil organic matter（SOM）,total nitrogen（TN）,available nitrogen（AN,hydrolytic nitrogen）,available phosphorus（AP）,and available potassium（AK） in an evergreen broadleaf forest of National Nature Reserve of Mount Tianmu,Zhejiang Province,China.Results showed that（1） an exponential model revealed the spatial structures of SOM and AN,whereas spherical models were used for TN and AP.In general,structure was the primary cause of the spatial variability,but SOM had a strong spatial autocorrelation with a spatial proportion of 0.787;TN,AN,and AP had moderate spatial autocorrelation.Due to its differences in active lag distance and its interval with different models explaining its spatial structure,AK had no clear spatial variability.（2） The maximum spatial autocorrelation for AN had a range from 4.21 to 169.50 m,whereas AP had a minimum.（3） Fractal dimensions from log-log semi-variograms quantitatively described spatial pattern differences and scale dependence of the five kinds of soil nutrients.Fractal dimensions were higher for AK,so AK spatial structure had a strong scale dependence with a complex spatial pattern.The fractal dimension of SOM was minimal,so its spatial pattern was relatively simple.Similar fractal dimensions for TN,AN,and AP explained their similar spatial patterns,but the small distinctions in their fractal dimensions did reveal local spatial structural variability.
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2011年第4期562-568,共7页
Journal of Zhejiang A&F University
基金
国家自然科学基金资助项目(30871963)
浙江省自然科学基金资助项目(Y3080261)
浙江农林大学研究生科研创新基金资助项目(2112009042)
关键词
土壤学
常绿阔叶林
土壤养分
空间变异
分形维数
自然保护区
soil science
evergreen broadleaf forest
soil nutrients
spatial variability
fractal dimension
nature reserve
