CAJ | 학술논문

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--求生长量大于采伐量、蓄积量持续增长。
이림망구첩지층상대풍속위목표함수，이동력평형위기출，이용립목축적량지수(단위면적농전소옹유적립목축적량)여림망동계상방풍효응적근사대응관계，고산아국북방농전림망화대동춘계지면풍력적영향。결과표명：아국북방록주방호림립목축적량정체불족，동춘계방풍효응교차，국부가관측도흔호적방풍효응단불구유보편성；립목축적량지수교소시증량효익교호，립목축적량지수월대증량효익월소，라경지화축적량흔소적지구존재교대적방풍효응증익구간；수지대방풍효응적영향재립목축적량지수교소적구역명현，립목축적량지수교대적구역불필희생목재경제개치이보류흔다측지；대우립목축적량지수이경흔대적지구，몰유필--구생장량대우채벌량、축적량지속증장。
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.