Response of Soil Extracellular Enzymes Activities to Throughfall Exclusion at Different Depths in a Subtropical Natural

CAO Pingli; SUN Siyi; LU Shengxu; ZHANG Jinxin; LIU Xiaofei; GUO Jianfen

doi:10.13870/j.cnki.stbcxb.2022.01.027

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Response of Soil Extracellular Enzymes Activities to Throughfall Exclusion at Different Depths in a Subtropical Natural

更新时间：2025-03-12

- Response of Soil Extracellular Enzymes Activities to Throughfall Exclusion at Different Depths in a Subtropical Natural
- Vol. 36, Issue 1, Pages: 205-211(2022)
- 作者机构：
  
  1. 福建师范大学地理研究所,福州,350007
  2. 福建师范大学湿润亚热带生态地理过程教育部重点实验室,福州,350007
  3. 闽江学院海洋学院,福州,350108
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.027
  CLC： S718.5
- Published：2022
- 稿件说明：
移动端阅览
CAO Pingli, SUN Siyi, LU Shengxu, et al. Response of Soil Extracellular Enzymes Activities to Throughfall Exclusion at Different Depths in a Subtropical Natural[J]. 2022, 36(1): 205-211.
DOI：

CAO Pingli, SUN Siyi, LU Shengxu, et al. Response of Soil Extracellular Enzymes Activities to Throughfall Exclusion at Different Depths in a Subtropical Natural[J]. 2022, 36(1): 205-211. DOI： 10.13870/j.cnki.stbcxb.2022.01.027.

摘要

随着全球变暖的加剧

降雨格局也在发生变化

土壤酶是森林生态系统化学过程的重要参与者

能够快速反映土壤环境的变化。因此研究亚热带土壤胞外酶活性对降水变化的响应

可有效评估气候变化对土壤有机质分解、转化的影响。以福建三明格氏栲自然保护区内的米槠天然林为研究对象

设置对照(CT)、隔离30%降雨(TE1)和隔离60%降雨(TE2) 3种处理

于2020年9月对不同土层(0—10

10—20

20—40

40—60 cm)土壤进行取样

研究9年的隔离降雨对不同土层土壤酶活性的影响。结果表明:不同程度隔离降雨后

4个土层的β—葡萄糖苷酶(βG)、β—N—乙酰氨基葡萄糖苷酶(NAG)和酸性磷酸酶(AP)活性均呈下降趋势。与CT相比

TE2处理0—40 cm土壤AP、βG和NAG酶活性均显著降低(P<0.05)

40—60 cm土壤AP酶活性在TE1和TE2处理中降低均较为显著。随着土层加深

3种土壤胞外酶活性均逐渐降低。冗余分析(RDA)表明

在0—10 cm土壤中

土壤含水量(SWC)、总氮(TN)和可溶性有机碳(DOC)是调控土壤胞外酶活性的主要因素

10—20 cm土壤胞外酶活性主要受控于可溶性有机碳(DOC)和铵态氮(NH4+—N)

而可溶性有机氮(DON) 和硝态氮(NO3-—N)是调控20—40 cm土层土壤胞外酶活性的关键因素。在40—60 cm土壤中

碳磷比(C∶P)主要影响着3种土壤胞外酶活性。可见

不同深度土壤胞外酶活性对降水减少的响应及调控因素不同。研究结果有助于进一步了解全球气候变化背景下亚热带森林土壤养分转化与循环机制。

Abstract

With the intensification of global warming

the rainfall pattern is also changing. Soil enzymes are the important participants in the chemical process of forest ecosystem and can quickly reflect the changes of soil environment. Therefore

studying the response of extracellular enzymes activities in subtropical soil to precipitation changes can effectively evaluate the impact of climate change on soil organic matter decomposition and transformation. In this study

the natural Castanopsis carlesii forest in Castanopsis kawakamii Nature Reserve of Sanming

Fujian Province was selected

and three treatments were set up

including control (CT)

30% of throughfall excluded (TE1) and 60% of throughfall excluded (TE2). In September 2020

soil samples of different soil layers (0—10

10—20

20—40

40—60 cm) in each treatment were collected to study the effects of 9-year throughfall exclusion on soil enzymes activities. The results showed that the activities of β-glucosidase (βG)

β-N-acetylglucosaminosidase (NAG) and acid phosphatase (AP) in the four soil layers decreased after throughfall exclusion. Compared with CT

the activities of AP

βG and NAG in 0—40 cm soil under TE2 treatment were significantly decreased (P <0.05)

and the activities of AP in 40—60 cm soil under TE1 and TE2 treatments were also significantly decreased. With increasing soil layers

the activities of three extracellular enzymes decreased. Redundancy analysis (RDA) showed that soil moisture content (SWC)

total nitrogen (TN) and soluble organic carbon (DOC) were the main factors regulating the activities of soil extracellular enzymes in 0—10 cm soil

while DOC and ammonium nitrogen (NH4+—N) in 10—20 cm

and soluble organic nitrogen (DON) and nitrate nitrogen (NO3-—N) in 20—40 cm. In 40—60 cm soil

the C∶P ratio mainly influenced the extracellular enzymes activities. In conclusion

the responses and regulatory factors of soil extracellular enzymes activities to the decrease of precipitation were different at different soil depths. The results of this study are helpful to further understand the mechanism of soil nutrient transformation and cycling in subtropical forests under global climate change.

关键词

Keywords

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