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研究了无断根沟的17 a生一路双行毛白杨农田防护林的细根特征。结果表明,在距林带5.0m范围和100 cm深农田内的单位土体细根特征值为:根重92.20g/m3,根长641.01m/m3,根表面积1.058 8m2/m3,根体积103.7 cm3/m3,根尖数301 481个/m3。农田内的各细根特征值都随距林带的距离的增加而降低,基本上随着土壤深度先增加后降低,较高值出现在距林带1.5m范围内的20~40 cm或40~60 cm土层,在1.5m到3.0m的区间迅速或明显降低,在3.0m或5.0m以外则缓慢降低并且细根特征的最大值上升到10~20 cm土层。由此可见,根系胁地最强的范围应在距林带3m以内。
The fine roots characteristics of 17-year-old single-line poplar farmland shelterbelts without rift gutters were studied. The results showed that the root eigenvalues of soils per unit area within 5.0 m range and 100 cm deep forest belts were: root weight 92.20g / m3, root length 641.01m / m3, root surface area 1.0588m2 / m3, root volume 103.7cm3 / m3, root tip number of 301 481 / m3. The eigenvalues of fine roots in farmlands decreased with the increase of the distance from forest belts, and basically increased with the increase of soil depth and then decreased. The highest values appeared in the range of 20-40 cm or 40-60 cm soil layer rapidly or significantly decreased in the range of 1.5 m to 3.0 m, slowly decreased beyond 3.0 m or 5.0 m, and the maximum value of fine root features increased to 10-20 cm soil layer. Thus it can be seen that the strongest root threatening range should be within 3m from the forest belt.