水竹择伐人工异龄林地下鞭结构及其与土壤间关系的研究

本文根据安徽省舒城县龙河地区水竹择伐人工异龄林15个土壤剖面分析测定结果和59个竹鞭样方调查资料，拟合出水竹林土壤物理性质和化学成分与地下鞭生物量、壮鞭比例和竹鞭分布深度间的回归方程22个。研究表明：竹鞭入土深度与土壤厚度关系较小，与土壤种类关系较大，与鞭龄关系密切。竹鞭分布在20cm土层中占62.82%，30cm占88.63%，土壤砂粒含量60—72%，粉粒含量16—26%，粘粒含量11—18%的壤质砂土，鞭量多，壮鞭比例高，入土浅。土壤容重为1.00—1.20，总孔隙度为43—61%，毛管孔隙度为33—46%，土壤表层有机质含量为0.46—1.24%，有效氮含量0.0080%，有效磷含量35ppm，有效钾含量45ppm，地下鞭生物量高。土壤质地疏松，孔隙适中，土壤肥沃，竹鞭入土深，壮鞭比例高。

STUDY ON RELATIONSHIP BETWEEN THE STRUCTURE OF UNDERGROUND RHIZOME OF UNEVEN-AGED PLANTED FISHSCALE BAMBOO FOREST(PHYLLOSTACHYS HETEROCALADA)THROUGH THE SELECTIVE CUTTING AND ITS SOIL

Based on the analysis of fifteen soil profiles and investigation on fi-fty-nine plots of planted fishscale bamboo of different ages through sele-ctiye cutting in the Long He area of Shucheng county, Anhui province,the relationship between the structure of underground rhizome, the depthof its extension, the proportion of vigorous rhizome and the principalphysical properties and the chemical composition of the soil are studied,and 22 regressive equations are also derived. The result shows that the depth of rhizomatous extension is little re-lated to the thickness of soil but is certainly related to the type of sloiand closely related to zhizome ages. The amounts of rhizome distributionwithin 20cm depth and 30cm depth are, respectively, 62.82% and 82.63%.In loam sandy soil with 60-72% sand particles, 16-20% powder particlesand 11-18% clay particles the weight of the rhizomes is larger and theproportion of vigorous rhizomes is higher, but the depth of extension inthe soil is shallower. In the soil with 1.00-1.20 specific gravity, 43-61% total porosity, 33-46% capillary porosity, 0.46-1.24% content oforganic matter in the surface layer of the soil, 0.0080% effective nitrogen,35ppm effective phosphorus and 45ppm effective potassium, the biomassesof underground rhizomes are higher. In loose, fertile and porous soil theextension of rhizome system is deeper.