Influence of Nitrogen Addition on Nutrient Residues and Water Holding Capacity of Forest Litter in Central Yunnan Plateau, China

XIAO Wenxian; SONG Yali; WANG Keqin; AN Wenxiong; SU Mengbai

doi:10.13870/j.cnki.stbcxb.2023.03.041

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Influence of Nitrogen Addition on Nutrient Residues and Water Holding Capacity of Forest Litter in Central Yunnan Plateau, China

更新时间：2025-03-12

- Influence of Nitrogen Addition on Nutrient Residues and Water Holding Capacity of Forest Litter in Central Yunnan Plateau, China
- Vol. 37, Issue 3, Pages: 319-329(2023)
- 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：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.03.041
  CLC： S715
- Published：2023
- 稿件说明：
移动端阅览
XIAO Wenxian, SONG Yali, WANG Keqin, et al. Influence of Nitrogen Addition on Nutrient Residues and Water Holding Capacity of Forest Litter in Central Yunnan Plateau, China[J]. 2023, 37(3): 319-329.
DOI：

XIAO Wenxian, SONG Yali, WANG Keqin, et al. Influence of Nitrogen Addition on Nutrient Residues and Water Holding Capacity of Forest Litter in Central Yunnan Plateau, China[J]. 2023, 37(3): 319-329. DOI： 10.13870/j.cnki.stbcxb.2023.03.041.

摘要

为揭示森林生态系统养分循环和水分循环对氮沉降的响应机制

以滇中高原华山松(Pinus armandii)和云南松(Pinus yunnanensis)为研究对象

开展野外氮添加下凋落叶、枝原位分解研究试验

设置对照、低氮、中氮和高氮共4个处理

利用尼龙网袋法和室内浸泡法

探究凋落叶、枝养分元素残留率、持水量和持水率及吸水速率对氮添加的响应。结果表明:(1)随着分解时间的持续

2种林分凋落叶、枝碳(C)、氮(N)、磷(P)分别呈释放、富集—释放、富集过程

凋落叶C、N、P残留率显著小于凋落枝(p＜0.05);(2)凋落叶最大持水量和最大吸水速率显著大于凋落枝(p＜0.05)

分解24个月时

与CK相比

LN处理下2种林分凋落叶、枝C

华山松凋落叶N残留率降低1.98%~7.27%

10.79%

HN处理下2种林分凋落叶、枝C

华山松凋落叶、枝和云南松凋落枝N

华山松凋落枝P残留率则增加4.26%~9.08%

11.94%~44.51%

42.42%;(3)分解24个月时

与CK相比

LN、MN和HN处理华山松凋落叶、枝和云南松凋落叶最大持水量和最大吸水速率分别降低11.44%~25.24%

5.81%~32.23%

云南松凋落枝则增加15.48%~24.26%

17.97%~23.74%。 (4)2种林分凋落叶、枝持水量随浸泡时间延长而增加

而吸水速率则为降低

持水量与浸泡时间的关系均呈对数函数关系(m=a+bln t)

吸水速率与浸泡时间的关系呈幂函数关系(v=at-b)。(5)C与云南松凋落枝持水性呈正相关关系(p＜0.05)

N与华山松凋落枝、P与华山松和云南松凋落叶持水性呈负相关关系(p＜0.05)。综上

氮添加通过改变凋落物分解过程中C、N、P养分元素残留特征进而影响其持水性。

Abstract

In order to reveal the response mechanism of nutrient cycling and water cycling to nitrogen deposition in forest ecosystem

we conducted a study on a situ decomposition of leaf and twig litters of Pinus armandii forest and Pinus yunnanensis forest in the middle Yunnan Plateau. Four treatments were set up: control (N 0 g/ (m2·a)

CK)

low nitrogen (N 10 g/ (m2·a)

LN)

medium nitrogen (N 20 g/ (m2·a)

MN) and high nitrogen (N 25 g/ (m2·a)

HN). Nylon mesh bag method and laboratory soaking method were used. The response of nutrient element residual rate

water holding capacity

water holding rate and water absorption rate of leaf and twig litters to nitrogen addition were explored. The results showed that: (1) With the continuation of decomposition time

carbon

nitrogen and phosphorus content of leaf and twig litters in two types of forests showed the trends of release

enrichment-release and enrichment

respectively

and the residue rates of C

N and P in leaf litters were significantly lower than those in twig litters (p ＜ 0.05). (2) The maximum water holding capacity and water absorption rate of leaf litters were significantly higher than that of twig litters (p ＜ 0.05). After 24 months of decomposition

compared with CK

the C residual rates of leaf and twig litters in two types of forests

and the N residual rate of leaf litters in P. armandii forest under LN treatment were reduced by 1.98%~7.27% and 10.79%

respectively. The C residual rates of leaf and twig litters in two types of forests

and the N residual rate of leaf and twig litters in P. armandii forest and twig litters in P. yunnanensis forest

the P residual rate of twig litters in P. armandii forest under HN treatment increased by 4.26%~9.08%

11.94%~44.51% and 42.42%

respectively. (3) After 24 months of decomposition

compared with CK

the maximum water holding capacity and water absorption rate of leaf and twig litters in P. armandii forest and leaf litters in P. yunnanensis forest under LN

MN and HN treatments decreased by 11.44%~25.24% and 5.81%~32.23%

respectively; while twig litters in P. yunnanensis forest increased by 15.48%~24.26%

17.97%~23.74%

respectively. (4) The water capacity of leaf and twig litters in two types of forests increased with the extension of soaking time

but the water absorption rate decreased. The relationship between water capacity and soaking time was logarithmic function (m=a+bln t)

and the relationship between water absorption rate and soaking time was power function (v=at-b). (5) C content was positively correlated with the water holding capacity of twig litters in P. yunnanensis forest (p ＜ 0.05)

N content was negatively correlated with the water holding capacity of leaf litters in two types of forests (p ＜ 0.05). In conclusion

nitrogen addition affects the water holding capacity of litters by changing the residual characteristics of C

N and P nutrient elements during the decomposition process.

关键词

Keywords

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