武夷山市茶园土壤有机质的空间分布特征

Spatial Distribution of Soil Organic Matter in Tea Gardens of Wuyishan City

测定了武夷山市8个茶园种植区266个混合土样中的土壤有机质(SOM)含量,用SPSS 22.0、GS+9.0和ArcGIS 10.5地统计学软件研究了茶园土壤SOM的空间分布。武夷山市8个种植区茶园SOM的平均含量大小表现为兴田镇(50.98g/kg)>武夷学院(43.45g/kg)>洋庄乡(39.44g/kg)>星村镇(37.55g/kg)>岚谷乡(35.08g/kg)>武夷山风景区(32.91g/kg)>吴屯乡(32.57g/kg)>五夫镇(28.64g/kg),依据国家土壤第2次普查的养分分级标准,各种植区SOM平均水处于三级以上,武夷山市茶园SOM的平均含量(37.24g/kg)处于二级以上,茶园SOM含量的变异系数介于22.75%~48.70%,属于中等空间变异;半方差函数模型拟合显示,武夷山风景区、吴屯镇和兴田镇茶园SOM的空间分布为球形模型,岚谷乡为线性模型,五夫镇、星村镇和洋庄乡为高斯模型,武夷学院为指数模型;武夷山风景区、武夷学院和星村镇茶园SOM空间自相关距离较大,分别为2.172、2.11、2.58km,其他种植区茶园SOM空间自相关距离相对较小;洋庄乡的茶园SOM具有强烈的空间相关性,岚谷乡的空间相关性较弱,其他6个种植区茶园SOM具有中等的空间相关性;武夷山市茶园SOM含量高值区主要集中在南部和中部,其次是西部,东部相对较低。茶园SOM含量与海拔呈一定的负相关,但差异不显著。

The concentration of soil organic matter(SOM)is detected from 266 topsoil composite samples(0~20cm)of eight tea planting areas in Wuyishan City,and their spatial distribution are studied by usingSPSS22.0 and geostatistics of GS+9.0 and ArcGIS 10.5.The results show as follow:SOM content order is 50.98g/kg(Xingtian)>43.45g/kg(Wuyi University)>39.44g/kg(Yang zhuang)>37.55g/kg(Xingcun)>35.08g/kg(Langu)>32.91g/kg(Wuyishan Scenery District)>32.57g/kg(Wutun)>28.64g/kg(Wufu).According to the Second National Soil Survey of Nutrient Classification Standards,and the average SOM level is level three or higher in each planting area,the SOM average content(37.24g/kg)of Wuyishan City is level two.The coefficient of variation of SOM from different planting areas is from 22.75%to 48.70%,belonging to medium spatial variation;The fitting results of semi-variogram model indicate that the spatial distribution of SOM is different,Wuyishan Scenery District,Wutun and Xingtian are in accordance with spherical model,Langu is in accordance with linear model,Wufu,Xingcun and Yangzhuang are in accordance with Gaussian model,Wuyi University is in accordance with exponential model.The distances variables are spatially-related,it is 2.172km for Wuyishan Scenery District,2.11km for Wuyi University and 2.58km for Xingcun,the spatially-related distances of other planting areas are relative small.There exists a strong spatial correlation in SOM content of Yangzhuang tea garden,a weak spatial correlation in Langu,and a medium spatial correlation in other six planting areas;The SOM high concentration areas are located at Xingtian in south part and Wuyi University in the middle part,while low concentration areas are located at Langu,Wutun and Wufu in the east part.The altitude has no significant effect on the SOM content.