我国绿洲防护林冬季相防风效应的估算  

Evaluation of Wind Protection Effect of Oasis Shelterbelts in China

作　　者：王志刚[1] 辛智鸣[1,2] 赵英铭[1] 马学献 陈峰[4] 乌拉[1] 肖彩虹[1] 

机构地区：[1]中国林业科学研究院沙漠林业实验中心,磴口015200 [2]内蒙古磴口荒漠生态系统定位研究站,磴口015200 [3]磴口县林业局,磴口015200 [4]巴彦淖尔市林业局,临河015000

出　　处：《林业科学》2014年第8期90-96,共7页Scientia Silvae Sinicae

基　　金："十二五"农村领域国家科技计划课题"干旱区沙漠边缘防风固沙体系构建技术研究与试验示范"(2012BAD16B0103);中央级公益性科研院所基本科研业务费专项资金"优良沙旱生树种种质资源整理;保存与共享"(CAFYBB2012003)

摘　　要：以林网区贴地层相对风速为目标函数,以动力平衡为基础,利用立木蓄积量指数(单位面积农田所拥有的立木蓄积量)与林网冬季相防风效应的近似对应关系,估算我国北方农田林网化对冬春季地面风力的影响。结果表明:我国北方绿洲防护林立木蓄积量整体不足,冬春季防风效应较差,局部可观测到很好的防风效应但不具有普遍性;立木蓄积量指数较小时增量效益较好,立木蓄积量指数越大增量效益越小,裸耕地和蓄积量很少的地区存在较大的防风效应增益区间;修枝对防风效应的影响在立木蓄积量指数较小的区域明显,立木蓄积量指数较大的区域不必牺牲木材经济价值而保留很多侧枝;对于立木蓄积量指数已经很大的地区,没有必要要求生长量大于采伐量、蓄积量持续增长。In order to better assess the wind protection effect of oasis protection forest in winter and spring in northern China,we evaluated the effect of farmland shelterbelts in northern China on the forest ground wind in winter and spring. The relative wind speed of shelterbelts stickers ’ layer was used as the objective function. Based on the dynamic equilibrium,the approximate correspondence relationship between the stock volume index （ per unit area of farmland owned by the stumpage） and wind protection effect of the farmland shelterbelts in winter was used to evaluate the effect of farmland shelterbelts in northern China on the forest ground wind in winter and spring. The results showed that the overall stock volume was insufficient in northern China oasis protection forest,and the wind protection effect was poor in winter and spring. Occasionally,a very good windbreak effect was observed in some locals,but the situation was not universal. Moreover,we found that the incremental benefit of wind protection was inversely proportional to the stock volume index. Bare arable land and the areas with smaller stock volume had bigger incremental space. Pruning operated in smaller stock volume index areas had more significant influence on wind protection effect. Thus,it is not necessary to keep collaterals by sacrificing the economic value of wood in those areas with bigger stock volume index. For those areas with relatively big stock volume index,the growing volume is not necessary bigger than the harvest volume and the storage volume.

关 键 词：农田防护林 相对风速 动力速度 农田面积 立木蓄积量 

分 类 号：S727.2[农业科学—林木遗传育种]