嫩江流域中下游防护林体系试验区综合效益分析

在对嫩江流域中下游防护林体系试验区内各林种进行科学规划设计的基础上,通过多年的实施和对该试验区农、林、牧各业的系统调查,以及多年、多点、多因子的观测研究。结果表明:该试验区生态、经济效益显著,其中,在降低水土流失方面,地表径流量、含沙量和冲刷量分别降低42.32%、12.77%和45.19%;在改良土壤方面,土层厚度提高141.86%,土壤含水率提高36.93%,土壤容重降低16.79%;活立木总价值6056.27万元,人均占有2.73万元,农牧业年均纯利润达830.65万元,人均纯收入3742.95元,该试验区为同类地区江河流域治理提供了样板。

ANALYSIS OF COMPREHENSIVE BENEFITS OF PROTECTION FOREST SYSTEM IN THE MIDDLE AND LOWER REACHES OF NEN RIVER

Based on scientifical planning of all kinds of protection forest in the middle and lower reaches of Nen River and many years studying in multiplots and multifactors,was got the result:in control of soil and water losses,surface runoff,sand content and abrasivity reduced by 42.32%,12.77% and 45.19% respectively;In soil improvement,soil thickness raised by 141.86%, water content of soil was 36.93% more,soil apparent density was 16.79% less;Total value of living trees was 605627 hundred yuan,273 hundred yuan on the average of each man.Yearly net benefit of agriculture and husbandry is up to 83065 hundred yuan and the net income for a person is 3742.95 yuan.