土地利用变化对闽江口湿地土壤生态酶化学计量特征的影响

刘子恺; 金圣圣; 余涵霞; 王维奇; 沈菊培; 贺纪正

doi:10.13870/j.cnki.stbcxb.2022.06.050

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土地利用变化对闽江口湿地土壤生态酶化学计量特征的影响

更新时间：2025-03-12

- 土地利用变化对闽江口湿地土壤生态酶化学计量特征的影响
- Effect of Land Use Change on the Eco-stoichiometric Characteristics in Min River Estuary Wetland
- 水土保持学报 2022年36卷第6期页码：410-416
- 作者机构：
  
  福建师范大学地理科学学院,福州,350007
- 作者简介：
- 基金信息：
  
  国家自然科学基金面上项目(32171642);2021年度福建省"闽江学者"特聘教授奖励
- DOI：10.13870/j.cnki.stbcxb.2022.06.050
  中图分类号： S154.1
- 纸质出版：2022
- 稿件说明：
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刘子恺, 金圣圣, 余涵霞, 等. 土地利用变化对闽江口湿地土壤生态酶化学计量特征的影响[J]. 水土保持学报, 2022,36(6):410-416.

LIU Zikai, JIN Shengsheng, YU Hanxia, et al. Effect of Land Use Change on the Eco-stoichiometric Characteristics in Min River Estuary Wetland[J]. 2022, 36(6): 410-416.
刘子恺, 金圣圣, 余涵霞, 等. 土地利用变化对闽江口湿地土壤生态酶化学计量特征的影响[J]. 水土保持学报, 2022,36(6):410-416. DOI： 10.13870/j.cnki.stbcxb.2022.06.050.

LIU Zikai, JIN Shengsheng, YU Hanxia, et al. Effect of Land Use Change on the Eco-stoichiometric Characteristics in Min River Estuary Wetland[J]. 2022, 36(6): 410-416. DOI： 10.13870/j.cnki.stbcxb.2022.06.050.

摘要

为探究闽江口湿地土地利用和恢复对土壤酶活性的影响

采集闽江口芦苇湿地、滩涂地、草地、农田和撂荒地5种不同土地利用方式

分析土壤β—葡萄糖苷酶、N—乙酰—氨基葡萄糖苷酶、L—亮氨酸—氨基肽酶和酸性磷酸酶活性及与环境因子之间的关系。结果表明:土壤pH、铵态氮和硝态氮在农田土壤显著高于其他土地利用方式;而土壤碳(C)、氮(N)、磷(P)全量含量在撂荒地和芦苇湿地显著高于其他土地利用方式。撂荒地、农田和芦苇湿地可溶性碳氮含量显著高于滩涂和草地土壤;土壤微生物量碳氮含量在不同土地利用方式间变化趋势比较一致

撂荒地均显著高于其他土地利用方式

分别为1 272

124 mg/kg。土壤酶活性变化趋势在不同土地利用方式间基本一致

即撂荒地最高

其次是芦苇湿地和农田

草地和滩涂最低。土壤酶活性矢量长度介于1.12~1.34

矢量角度均大于45°

且土壤胞外酶生态化学计量C∶N∶P总体上为1.00∶1.03∶1.33

表现出主要受磷限制的影响。土壤酶活性与可溶性碳氮、总碳氮和微生物量碳氮均呈显著正相关。研究结果表明

芦苇湿地转化为滩涂等利用方式后土壤碳氮等养分显著降低

而撂荒等方式可提高土壤养分含量

促进土壤微生物活性

进而有利于湿地生态系统的恢复和改善。

Abstract

Soil enzymes activities are important indicators for ecosystem function

playing key roles in nutrient cycling. In this study

five different land use types in Min River estuary wetland

i.e. reed wetland

tidal flat

grassland

farmland and fallow

were selected to investigate the effects of land use changes and restoration on soil enzymes activities as well as their relationship with soil properties. Soil enzymes activities including β—Glucosidase

N—Acetyl—β—glucosaminidase

L—Leucine aminopeptidase and phosphatase were detected. Results showed that soil pH

NH4+—N and NO3-—N contents were significantly higher in farmland than other land uses

while soil total carbon (C)

nitrogen (N)

and phosphorous (P) were significantly higher in fallow and reed wetland. Soil DOC

DON contents were significantly higher in fallow land

farmland and reed wetland than tidal flat and grassland. Soil microbial biomass carbon and nitrogen showed similar trend along different land uses with the highest in fallow land around 1 272 and 124 mg/kg

respectively. Soil enzymes activities showed similar pattern along different land uses

with the highest in fallow land

followed by reed wetland

farmland

grassland and tidal flat. Soil enzyme vector length ranged from 1.12~1.34

while all the vector angles were over 45°. Additionally

enzymatic eco-stoichiometric value was 1.00∶1.03∶1.33

indicating all the land uses were limited by phosphorus. Soil enzymes activities were significantly related with DOC

DON

microbial biomass C and N. These findings indicated that land use change from reed wetland to tidal flat significantly reduced soil nutrients

while fallow land increased soil microbial function

thereby providing alternative restoration strategy for wetland.

关键词

Keywords

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