Study on the Decomposition and Water Holding Capacity of Flower and Leaf Litter Mixtures of

WU Di; HAN Zhencheng; LI Weijie; TIAN Ao; WANG Jiaguo

doi:10.13870/j.cnki.stbcxb.2020.05.026

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Study on the Decomposition and Water Holding Capacity of Flower and Leaf Litter Mixtures of

更新时间：2025-03-12

- Study on the Decomposition and Water Holding Capacity of Flower and Leaf Litter Mixtures of
- Vol. 34, Issue 5, Pages: 186-191(2020)
- 作者机构：
  
  贵州省山地资源研究所,贵阳,550001
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.05.026
  CLC： S714.7
- Published：2020
- 稿件说明：
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WU Di, HAN Zhencheng, LI Weijie, et al. Study on the Decomposition and Water Holding Capacity of Flower and Leaf Litter Mixtures of[J]. 2020, 34(5): 186-191.
DOI：

WU Di, HAN Zhencheng, LI Weijie, et al. Study on the Decomposition and Water Holding Capacity of Flower and Leaf Litter Mixtures of[J]. 2020, 34(5): 186-191. DOI： 10.13870/j.cnki.stbcxb.2020.05.026.

摘要

为揭示马缨杜鹃花叶凋落物对百里杜鹃保护区生态水文功能的影响，采用凋落物分解袋法及室内浸泡法对马缨杜鹃花、叶凋落物分解过程中的持水性能进行研究。结果表明：（1）马缨杜鹃花叶混合凋落物的累积分解率随分解时间及花比例的增加而增加，各花叶混合凋落物累积分解率在纯花及纯叶凋落物之间变化。（2）马缨杜鹃花叶混合凋落物的持水率与浸水时间呈对数函数关系（R=aln t+b，R2>0.80），浸水初期2 h内迅速增加，2~8 h时缓慢增加，8 h后趋于平缓并逐渐达到饱和；而凋落物的持水速率均随着浸泡时间的增加而下降，持水速率与浸泡时间呈幂函数关系（V=ktn，R2>0.99），持水速率在浸水初期4 h最大，后逐渐趋于一致；（3）马缨杜鹃花叶混合凋落物最大持水率随着分解时间及花比例的增加逐渐升高，但不同花叶比例凋落物持水率的差异逐渐减小；（4）马缨杜鹃花叶凋落物最大持水量受分解率和最大持水率的共同调控，在分解0~360天时随花比例增加而增加，分解450天后花叶比例不再影响马缨杜鹃林下凋落物层的最大持水量。整体来看，马缨杜鹃花凋落物对叶凋落物分解及花叶凋落物持水功能有很大的影响，对花凋落物进行回收利用不宜超过现存量的50%。

Abstract

To uncover the eco-hydrological influence of flower and leaf litters of Rhododendron delavayi at the Baili Dujuan Natural Reserve

the litter bag method in the field and indoor soaking method were applied to study the water holding characteristic of flower-leaf mixture during their decomposition. The results were as follows: (1) The cumulative decomposition rates of R. delavayi increased with decomposition time and growing flower ratio

and the cumulative decomposition rates of each flower-leaf mixture rate varied between the pure flower and pure leaf litters; (2) The relation between water holding ratio and soaking time was a logarithmic function (R=a ln t+b

R2>0.80)

the water holding ratio increased instantly within two hours

then turned to slowly within 2~8 hours and leveled off after 8 hours; while the absorption speed rates of litters decreases with soaking time in a power function as (V=ktn

R2>0.99)

with the highest absorption speed rate within 4 hours and levelled off thereafter; (3) The maximum water holding rate of different flower-leaf mixture litters increased with decomposition time and flower ratios

but the difference among different flower ratios was lowered with decomposition time; (4) The maximum water holding capacity of different flower-leaf mixture was regulated by the decomposition rate and water holding rate. The maximum water holding capacity of different flower-leaf mixture of R. delavayi increased with flower ratio during 0~360 days

while the flower ratio didn’t work after 450 days of decomposition. In a whole

the R. delavayi utilization should not exceed the half of the current flower litter to maintain the litter decomposition rate and improve the water holding rate.

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