提高农桐栽培群落稳定性的研究

RESEARCH ON INCREASING THE STABILITY OF CROPS AND PAULOWNIA TREES CULTURE COMMUNITY

农桐栽培群落存在的问题和原因是：１．泡桐栽植过密，遮荫较重，２．颇繁调整土地使用权，导致农民刨树，３．农林栽培群落的类型和树种单一，树木遗传基因型不断窄化，４．泡桐病虫害发生普遍，危害日趋加重，５．农桐栽培群落的结构未优化；６．桐木销路不畅。对策是：１．加强宣传教育，正确认识农桐间作；２．优化农桐栽培群落的结构，合理密植；３．完善农村经济体制，稳定土地使用权；４．合理选择树种，适时采伐，５．因地制宜建立多种整体效益高的农林栽培群落，６．综合治理泡桐病虫害；７．拓宽桐木销路，发展桐木加工。

The problems of cultivating crop community and paulownia trees and the causesare ① the great density of planted paulownia trees; ② frequent change of right to land.use,which forced farmers to cut down the trees, ③ simple patterns and tree species of cultivating crops and forest trees are all single; ④ the wide spreed occurrance of the diseases andPests damaging paulownia trees; ⑤ the structure of cultivating crop community andpaulownia trees to be improved, ⑥ a poor market for the paulownia lumber. Thecountermeasure to be employed is (a) understranding intercropping crops and paulowniatrees, (b) improving the structure of the culture community and rational close planting; (c)perfecting the economic system in the countryside and keeping the right to land use stable;(d) the paulownia species to be selected correctly and the paulownia trees to be cut downtimely, (e) setting up various growing communities of crops and forest trees with high bene fit suitable to local conditions; (f) employing methods of integrated pest management to pre vent and crue the paulownia diseases and insect pests; (g) a good sale market for paulowniatimber and developing the processing of paulownia timber.