Discussion And Research On Theoretics And Practices Of Conversion Cropland To Forestland In Zhangye

Conversion cropland to forestland is the biggest forest bionomicalconstructible engineering in the history of Zhang Ye. This engineering has an importantmeaning on improving local bionomic economy, adjusting country economic structure,enhance farmers' lives, reasonable using water resource and sustainable development ofsocietal economy. In this article by collecting many engineering constructible experiences,summary, cases and experimental data, the theoretics of conversion cropland to forestlandin Zhang Ye was analyzed and explained . At the same time this area's engineeringconstructible layout, the main trees choice and marshalcy, mode and technique ofconversion cropland to forestland, management and effect after virescence, analysisevaluation of the integrative benefit of conversion cropland to forestland, saving watertechnique in arid area, engineering following construction etc were emphasis onstudied .The result showed that:1,The conversion cropland to forestland engineering has the rationality of economicsin Zhang Ye. The engineering's construction not only is simple ecosystem instauration, butalso includes relocation of the resources and the reconstruction of the economy system.Taking black river area as unit, the engineer construction must boost steadily, build oasiscompound ecosystem system. The technique of back and seal were carried together withpolicy timing.2,Basic on the local natural condition and forestation practical experience for manyyears, the areas of conversion cropland to forestland were divided into three parts ofnorth sand district, middle oasis shelterbelt and south Qilianshan Qu. Every part'scharacteristic was analyzed , and the measure of conversion cropland to forestland wasbought by these characteristics.3,In order to run the fruit of conversion cropland to forestland, many successfulexperiences were summarized such as recruiting bear perishing rats, sealing mountainrearing forest, ecological emigrant, artificial protecting etc. the investigating proves thatbear can clearly control rat from the Yingdun 1 kilometer inside. Following the mountainarea the measure of conversion the cropland tohippophae rhamnoides forest wasactualized 3 years, the grass biological quantity of forest has been as1.67-2.22 times muchas contrast part. The tohippophae rhamnoides high , terra pathway , crown is as 3.74,1.70,2.93 times much as contrast part. The conserver rate of tohippophae rhamnoidesis heighten 20%.4,Through evaluating the integrated benefit of conversion cropland to forestland inZhangye city Shandan country, the ecological benefit of the conversion cropland toforestland engineering is huge, social benefit is prominence, economic benefit isconsiderable. To the end of 2004, all the production of average year is 86.71 million,ecological benefit occupies 12.34 million , social benefit is 27.82 million , economicbenefit is 46.55million.5,Through afforestation practice and experiment research in the arid hill country, thesuccessful method of saving water to afforest in this area is: the whole ground woke mustbe done well before the last year autumn raining season arriving, the water contain of soilshould be raised possibly; when the water contain is above 25% in the planting deep of30cm, foresting need not irrigate the root, which can reduce the cost. While the watercontain ratio of soil is low 25%, exactitude planting method is adopted, and fitting rootwater is needed. The trees in the arid area surviving ration attend above 80% by feasiblesaving water and foresting technique which can reduce the cost.6,Through thorough study of industry that ensue conversion cropland to forestland inthe city, successful and typical development mode is concluded. Meanwhile theconstruction of industry that ensue conversion cropland to forestland is in the state of theinchoate exploring outset, industry links has not been formed. The government should playmore instruction pole in the macro-scale, reinforce the technological support andconstruction of key enterprise, policies should be cooperated, surplus labors weretransferred, particular forest - fruit industry and livestock farm were developed.