Changes in nodule and root biomass of Sesbania sesban and Leucaena leucocephala following coppicing
Changes in nodule and root biomass of Sesbania sesban and Leucaena leucocephala following coppicing
复制标题
修剪后田菁和银合欢根瘤和根生物量的变化
DOI：
10.1007/bf00011802
复制
发表时间：
1991
期刊：
影响因子：
4.9
通讯作者：
David G. Anderson
中科院分区：
文献类型：
--
作者：
J. Fownes;David G. Anderson
通过盆栽试验，研究了田菁和银合欢抚育后细根和根瘤脱落的程度，并确定了控制细根和根瘤脱落的因素。细根（<2 mm）生物量低于切割前的值，但在两个物种中的减少没有统计学意义。两个物种的活（白色）根瘤生物量减少和死亡（棕色）根瘤生物量增加后两个星期削减显着。这些变化是相对较大的田菁比银合欢。在两个物种的未切割处理，细根和根瘤生物量与叶生物量，并在切割处理，根和根瘤生物量恢复到接近这一明显的平衡切割后两个星期。每单位叶面积的茎生长速率切割和未切割处理之间没有差异，也不与任何一个物种的根：叶比。银合欢的地下生物量占总生物量的比例大于田菁，粗根（>2 mm）占地下生物量的比例大于田菁。这些结果是一致的假设，即相对较低的分配地下存储组织是田菁的相对更大的敏感性切割的原因。
A pot study was conducted to measure the extent of and determine the factors controlling fine root and nodule shedding following coppicing ofSesbania sesbanandLeucaena leucocephala. Fine (<2 mm) root biomass decreased below pre-cutting values, but the decreases were not statistically significant in either species. Living (white) nodule biomass decreased and dead (brown) nodule biomass increased significantly two weeks after cutting in both species. These changes were relatively greater in Sesbania than in Leucaena. In the uncut treatments of both species, fine root and nodule biomass were correlated with leaf biomass, and in the cut treatments, root and nodule biomass returned to near this apparent equilibrium by two weeks after cutting. Stem growth rate per unit leaf area was not different between cut and uncut treatments, nor was it correlated with root:leaf ratios in either species. Leucaena allocated a greater fraction of its total biomass below-ground, and a greater fraction of its below-ground biomass to coarse (>2 mm) roots than Sesbania. These results are consistent with the hypothesis that relatively lower allocation to below-ground storage tissue is the cause for Sesbania's relatively greater sensitivity to cutting.