儋州市橡胶园土壤磷素空间变异及分区管理研究

采用传统统计和地统计相结合的方法，对面积约720km2的儋州市橡胶园土壤磷素营养进行了空间变异特征与分区管理技术研究。结果表明，儋州市橡胶园各土层全磷含量、速效磷含量分别为中等程度变异和强变异；土壤磷素营养缺乏，各土层全磷含量78.56%以上地区处于极低水平，5.08%以上地区速效磷含量在0~20cm、20~40cm土层为中等含量水平，但有小部分处于较好和极低水平；土壤全磷和速效磷含量的最大相关距离在10.34~69.24 km之间，全磷含量基本趋于大块状变异为主，而速效磷含量空间分布为大块状和小块状交叉分布。采用空间叠加方法，进行了橡胶园土壤磷素管理分区，整个研究区域可分为11个磷素管理区，每个分区内具有不同的土壤磷素营养状况，需采取不同的磷素营养管理措施。

Spatial variability and regionalized management of soil phosphorus nutrients in the rubber plantation in Danzhou city

Spatial variability and regionalized management technology of soil phosphorus in rubber plantation with an area of about720 km2 was studied by traditional statistics and geo-statistics. The results showed the contents of total phosphorus (TP) and availablephosphorus (AP) of all soil layers in the rubber plantations in Danzhou city respectively belonged to moderate and strong variation. The rubber plantation soil in Danzhou city was widely deficient in the content of soil P, the content of TP above 78.56% rubber plantation appeared in extremely low level, but the content of AP in layers of 0~20 cm and 20~40 cm above 55.08% rubber plantation appeared in moderated level and in small rubber plantation appeared in good or extremely low level. The maximum correlative distance of Total P,Available P in content in different soil layers were between10.34 km and 69.24 km.The distribution of total P content developed in large block structure, but the content of available P in soil layers of 0~20 cm and 20~40 cm appeared of cross-distribution between largeblocked structure and small blocked structure. By overlaying method of the space, the whole researching region could be regionalized into11 management units of phosphorus nutrient. In every unit, different governing technology must be taken because of different status of Pnutrient.