氮沉降下滇中高原森林凋落物分解特征对其持水性的影响

肖文贤; 王克勤; 宋娅丽; 安文雄

doi:10.13870/j.cnki.stbcxb.2023.01.030

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氮沉降下滇中高原森林凋落物分解特征对其持水性的影响

更新时间：2025-03-12

- 氮沉降下滇中高原森林凋落物分解特征对其持水性的影响
- Influence of Decomposition Characteristics of Forest Litter on Water Holding Capacity Under Nitrogen Deposition in Central Yunnan Plateau
- 水土保持学报 2023年37卷第1期页码：227-237
- 作者机构：
  
  1. 西南林业大学生态与环境学院,昆明,650224
  2. 国家林业和草原局云南玉溪森林生态系统国家定位观测研究站,昆明,650224
- 作者简介：
  
  [ "肖文贤(1991-),女,在读硕士研究生,主要从事森林生态系统水文功能研究。E-mail:845388187@qq.com" ]
- 基金信息：
  
  云南省教育厅科学研究基金项目(2022J0510);云南省科技厅"三区"人才支持计划(90202101);云南省自然生态监测网络项目云南玉溪森林生态站项目(2022-YN-13);云南玉溪森林生态系统国家长期科研基地项目(2020132550)
- DOI：10.13870/j.cnki.stbcxb.2023.01.030
  中图分类号： S715
- 纸质出版：2023
- 稿件说明：
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肖文贤, 王克勤, 宋娅丽, 等. 氮沉降下滇中高原森林凋落物分解特征对其持水性的影响[J]. 水土保持学报, 2023,37(1):227-237.

XIAO Wenxian, WANG Keqin, SONG Yali, et al. Influence of Decomposition Characteristics of Forest Litter on Water Holding Capacity Under Nitrogen Deposition in Central Yunnan Plateau[J]. 2023, 37(1): 227-237.
肖文贤, 王克勤, 宋娅丽, 等. 氮沉降下滇中高原森林凋落物分解特征对其持水性的影响[J]. 水土保持学报, 2023,37(1):227-237. DOI： 10.13870/j.cnki.stbcxb.2023.01.030.

XIAO Wenxian, WANG Keqin, SONG Yali, et al. Influence of Decomposition Characteristics of Forest Litter on Water Holding Capacity Under Nitrogen Deposition in Central Yunnan Plateau[J]. 2023, 37(1): 227-237. DOI： 10.13870/j.cnki.stbcxb.2023.01.030.

摘要

研究模拟氮沉降下凋落物分解特征对其持水性的影响

旨在为氮沉降背景下森林生态系统养分循环和水分循环相关研究提供理论依据。以滇中高原常绿阔叶林和高山栎林为研究对象

在野外开展模拟氮沉降下凋落叶、枝原位分解研究试验

设置0(对照CK)

10(低氮LN)

20(中氮MN)

25(高氮HN) g/(m2·a)N共4种处理

利用尼龙网袋法和室内浸泡法

探究不同处理下凋落叶、枝质量残留率、持水量和持水率及吸水速率变化特征。结果表明:(1) 2种林分凋落叶、枝质量残留率随分解时间延长而减少;与CK质量残留率相比

LN处理2种林分凋落叶、枝无显著影响(p>0.05)

MN和HN处理使常绿阔叶林凋落叶分解第16

24个月和HN处理高山栎林凋落叶分解第16个月分别增加5.05%~7.45%

7.88%~8.62%

4.72%。(2)与CK分解95%所需时间相比

LN处理使常绿阔叶林凋落叶、枝和高山栎林凋落枝分别增加0.549

0.366

0.402年

高山栎林凋落叶则减少1.011年

MN和HN处理使2种林分落叶、枝增加0.236~3.638年。(3)分解时间和氮沉降及其二者交互作用显著影响凋落叶、枝最大持水量、最大持水率和最大吸水速率(p<0.001);与CK最大持水量、最大持水率和最大吸水速率相比

LN和MN处理使常绿阔叶林凋落叶分别减少21.99%

6.47%

54.47%

16.14%

4.15%

1.25%

HN处理分别增加0.24%

0.80%

0.96%

LN、MN和HN处理使常绿阔叶林凋落枝和高山栎林凋落叶、枝分别增加8.03%~38.22%

5.47%~60.00%

0.46%~5.72%。(4) 2种林分凋落叶、枝持水量和持水率与浸泡时间呈对数函数关系(m=a+bln t)

吸水速率与浸泡时间呈幂函数关系(v=at-b)。(5)常绿阔叶林凋落叶和高山栎林凋落枝质量残留率分别与其最大持水量、最大持水率和最大吸水速率呈显著正相关关系(p＜0.05)。综上

凋落物持水性受其分解阶段和氮沉降干扰的影响。

Abstract

To study the influence of decomposition characteristics of litter on their water holding capacity under simulated nitrogen (N) deposition so as to provide a theoretical basis for the study of nutrient and water cycling in forest ecosystem under N deposition. The evergreen broad-leaved forest and Quercus semicarpifolia forest in central Yunnan Plateau were selected to conduct in situ leaf litter and twig decomposition experiment with four N treatment levels of 0 (control check CK)

10 (low nitrogen LN)

20 (medium nitrogen MN) and 25 (high nitrogen HN) g/(m2·a)N. Litterbag method and the laboratory immersion method were used to explore the variation characteristics of mass remaining rate

water holding capacity

water holding rate and water absorption rate of leaf litter and twig litter under different treatment. The results showed that: (1) The mass remaining rate of leaf litter and twig litter in two forest types decreased with the extension of decomposition time. Compared with the mass remaining rate of CK

LN treatment had no significant effect on leaf litter and twig litter in two forest types. MN and HN treatments increased leaf litter decomposition in evergreen broad-leaved forest at 16

24 months and HN treatment increased leaf litter decomposition in Q. semicarpifolia forest at 16 months by 5.05%~7.45%

7.88%~8.62% and 4.72%

respectively. (2) Compared with the CK

LN treatment increased the time required for 95% decomposition of leaf litter and twig litter in evergreen broad-leaved forest and twig litter in Q. semicarpifolia forest by 0.549

0.366 and 0.402 years

respectively

while that of leaf litter in Q. semicarpifolia forest decreased by 1.011 years

and that of leaf litter and twig litter in two forest types under MN and HN treatment increased by 0.236~3.638 years. (3) The decomposition time

nitrogen deposition and their interaction significantly affected the maximum water holding capacity

maximum water holding rate

maximum water absorption of leaf litter and twig litter (p<0.001). Compared with the CK

the maximum water holding capacity

maximum water holding rate

maximum water absorption of leaf litter in evergreen broad-leaved forest under LN and MN treatments decreased by 21.99%

6.47%

54.47%

16.14%

4.15% and 1.25%

respectively

and those under HN treatment increased by 0.24%

0.80%

and 0.96%

respectively

and in LN and MN and HN treatments

those of twig litter in evergreen broad-leave forest and leaf and twig litter in Q. semicarpifolia forest increased by 8.03%~38.22%

5.47%~60.00% and 0.46%~5.72%

respectively. (4) The relationship between water holding capacity and the water holding rate of leaf litter and twig litter in two forest types and immersion time was a logarithmic function (m=a+bln t)

and the water absorption rate was exponentially related to immersion time (v=at-b). (5) The mass remaining rate of leaf litter in evergreen broad-leaved forest and that of twig litter in Q. semicarpifolia forest were significantly and positively correlated with their maximum water holding capacity

maximum water holding rate and maximum water absorption rate

respectively (p<0.05). In conclusion

the water holding capacity of litter was affected by the decomposition stage and nitrogen deposition.

关键词

Keywords

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