Effects of Nitrogen Addition and Litter Increase or Decrease on Soil Aggregates and Their C and N in Evergreen Broad-leaved Forest in Rain Screen Area of West China

Lü Siyang; SONG Siyi; LI Yunjie; ZHONG Qi; MA Wei; TU Lihua

doi:10.13870/j.cnki.stbcxb.2022.01.036

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Effects of Nitrogen Addition and Litter Increase or Decrease on Soil Aggregates and Their C and N in Evergreen Broad-leaved Forest in Rain Screen Area of West China

更新时间：2025-03-12

- Effects of Nitrogen Addition and Litter Increase or Decrease on Soil Aggregates and Their C and N in Evergreen Broad-leaved Forest in Rain Screen Area of West China
- Vol. 36, Issue 1, Pages: 277-287(2022)
- 作者机构：
  
  1. 四川农业大学林学院, 长江上游森林资源保育与生态安全国家林业和草原局重点实验室, 长江上游林业生态工程四川省重点实验室,成都,611130
  2. 四川省眉山市东坡区岷江现代农业示范园区管理委员会,四川,眉山,620039
  3. 中共青神县委组织部,四川,眉山,620400
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.036
  CLC： S153.6
- Published：2022
- 稿件说明：
移动端阅览
Lü Siyang, SONG Siyi, LI Yunjie, et al. Effects of Nitrogen Addition and Litter Increase or Decrease on Soil Aggregates and Their C and N in Evergreen Broad-leaved Forest in Rain Screen Area of West China[J]. 2022, 36(1): 277-287.
DOI：

Lü Siyang, SONG Siyi, LI Yunjie, et al. Effects of Nitrogen Addition and Litter Increase or Decrease on Soil Aggregates and Their C and N in Evergreen Broad-leaved Forest in Rain Screen Area of West China[J]. 2022, 36(1): 277-287. DOI： 10.13870/j.cnki.stbcxb.2022.01.036.

摘要

大气氮沉降可通过改变土壤氮素可利用性(直接影响)和改变凋落物输入量(间接影响)对森林土壤碳氮动态产生影响。土壤团聚体是森林表层土壤最具代表性的基本结构单元

对于稳定贮存有机碳氮具有重要意义。通过氮添加和凋落物增减试验设计

探索氮添加和凋落物增减对土壤团聚体及其碳氮组分的影响。结果表明: (1)凋落物增加(+L)和减少(-L)都使A层土壤(0-10 cm)以及各粒径团聚体的TOC(有机碳)、TN(全氮)含量显著提高

使pH显著降低。氮添加使B层土壤(10-30 cm)pH显著降低

表现为高氮(HN)<低氮(LN)<对照(CK)

其中HN还使A层土壤pH显著降低

使B层土壤以及各粒径团聚体的TOC含量显著提高。氮添加和凋落物增减并未显著影响土壤团聚体的稳定性。(2)A、B层土壤均以水稳性大团聚体(>0.25 mm)为优势粒径

粉黏粒组分(< 0.053 mm)占比最低。TOC和TN的分布规律在A、B层土壤中相同

>2 mm团聚体的TOC和TN含量最高

0.25~2 mm团聚体的TOC和TN含量最低

A层高于B层

TOC和TN含量随着土壤团聚体粒径的减小呈"V"形分布。(3)土壤团聚体的稳定性与TOC、TN、AN、AP含量呈显著正相关

与pH显著负相关。研究结果可为森林可持续经营提供参考。

Abstract

Atmospheric nitrogen deposition can affect soil carbon and nitrogen dynamics by changing soil nitrogen availability (direct effect) and litter input (indirect effect). Soil aggregate is the most representative basic structural unit of forest topsoil

which is of great significance for the stable storage of organic carbon and nitrogen. The results showed that: (1) The contents of TOC (total organic carbon) and TN (total nitrogen) in layer A soil and aggregates with different particle sizes were significantly increased

and soil pH was significantly decreased by increasing (+L) and decreasing (-L) litter. Nitrogen addition significantly reduced the soil pH in layer B

which showed high nitrogen (HN) < low nitrogen (LN) < control (CK)

and HN also significantly reduced the soil pH in layer A

and significantly increased the TOC content in layer B and aggregates. The addition of nitrogen and litter increase or decrease did not significantly affect the stability of soil aggregates. (2) Water stable macro aggregates (> 0.25 mm) was the dominant particle size in soil A and B

and the proportion of silt and clay (< 0.053 mm) was the lowest. The distribution of TOC and TN was the same in layer A and B. the contents of TOC and TN in > 2 mm aggregates were the highest

while those in 0.25 ~ 2 mm aggregates were the lowest. The contents of TOC and TN in layer A were higher than those in layer B. the contents of TOC and TN showed a V-shaped distribution with the decrease of soil aggregate size. (3) The stability of soil aggregates was positively correlated with the contents of TOC

AN and AP

and negatively correlated with pH. The research results can provide reference for sustainable forest management.

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