Response of Soil Organic Nitrogen Fractions to Nitrogen Deposition in a Subtropical Natural

CAO Pingli; SUN Siyi; LU Shengxu; LIN Hao; LIU Xiaofei; LIN Weisheng; GUO Jianfen

doi:10.13870/j.cnki.stbcxb.2023.04.030

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Response of Soil Organic Nitrogen Fractions to Nitrogen Deposition in a Subtropical Natural

更新时间：2025-03-12

- Response of Soil Organic Nitrogen Fractions to Nitrogen Deposition in a Subtropical Natural
- Vol. 37, Issue 4, Pages: 243-249(2023)
- 作者机构：
  
  1. 福建师范大学地理研究所,福州,350007
  2. 福建省植物生理生态重点实验室,福州,350007
  3. 福建三明森林生态系统国家野外科学观测研究站,福建,三明,365002
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.04.030
  CLC： S718.5
- Published：2023
- 稿件说明：
移动端阅览
CAO Pingli, SUN Siyi, LU Shengxu, et al. Response of Soil Organic Nitrogen Fractions to Nitrogen Deposition in a Subtropical Natural[J]. 2023, 37(4): 243-249.
DOI：

CAO Pingli, SUN Siyi, LU Shengxu, et al. Response of Soil Organic Nitrogen Fractions to Nitrogen Deposition in a Subtropical Natural[J]. 2023, 37(4): 243-249. DOI： 10.13870/j.cnki.stbcxb.2023.04.030.

摘要

随着人类活动向大气排放越来越多的氮化合物

生态系统中的氮含量逐渐呈现饱和状态

亚热带地区已成为全球氮沉降最严重的区域之一。土壤有机氮组分能直观反映土壤氮素有效性对氮沉降的响应。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

探讨不同施氮水平对土壤有机氮组分的影响。结果表明:(1)高氮处理下土壤有机氮(SON)含量(1.23 g/kg)显著高于对照处理(0.89 g/kg)

高氮处理的土壤活性氮组分(LP Ⅰ-N+LP Ⅱ-N)含量(0.28 g/kg)显著高于低氮(0.24 g/kg)和对照处理(0.22 g/kg)

而土壤惰性氮组分(RP-N)含量在高氮(0.94 g/kg)和低氮(0.82 g/kg)处理中都显著高于对照处理(0.68 g/kg)。(2)与对照和低氮处理相比

高氮处理显著提高土壤全氮(TN)、微生物生物量氮 (MBN)、铵态氮(NH4+-N)含量和β-N-乙酰氨基葡萄糖苷酶(NAG)活性(p<0.05)

硝态氮(NO3--N)、可溶性有机氮(DON)含量和β-葡萄糖苷酶(βG)、纤维素水解酶(CBH)活性随着施氮量的增加均呈上升趋势。(3)冗余分析(RDA)表明

土壤TN、NAG酶与有机氮及其各组分呈显著正相关

而土壤MBN、NH4+-N与土壤有机氮及其各组分的相关性也较强。可见该区域氮沉降提高土壤氮养分有效性和微生物活性

这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

As more and more nitrogen fractions are discharged into the atmosphere by human activities

the nitrogen content in the ecosystem gradually becomes saturated

and subtropical region has become one of the regions with the most serious nitrogen deposition in the world. Soil organic nitrogen (SON) fractions can directly reflect the response of soil nitrogen availability to nitrogen deposition. The effects of different nitrogen application levels on SON fractions were studied in a natural Castanopsis carlesii forest in the Castanopsis kawakamii Nature Reserve located in Sanming

Fujian Province. The results showed that: (1) SON content under high nitrogen treatment (1.23 g/kg) was significantly higher than that under control treatment (0.89 g/kg). The content of soil labile nitrogen fraction (LPⅠ-N + LPⅡ-N) in high nitrogen treatment (0.28 g/kg) was significantly higher than that in low nitrogen (0.24 g/kg) and control treatments (0.22 g/kg). Soil recalcitrant nitrogen (RP-N) contents in high nitrogen (0.94 g/kg) and low nitrogen (0.82 g/kg) treatments were significantly higher than that in control (0.68 g/kg). (2) Compared with control and low nitrogen treatment

high nitrogen treatment significantly increased the contents of soil total nitrogen (TN)

microbial biomass nitrogen (MBN)

ammonium nitrogen (NH4+-N) and β-N-acetylglucosaminidase (NAG) activity (p<0.05). The contents of nitrate nitrogen (NO3--N)

dissolved organic nitrogen (DON) and the activities of β-glucosidase (βG) and cellulolytic enzyme (CBH) showed an increasing trend with the increase of nitrogen application level. (3) Redundancy analysis (RDA) showed that soil TN and NAG enzymes were positively correlated with organic nitrogen and its fractions

while soil MBN and NH4+-N were correlated with SON fractions. Overall

nitrogen deposition in this region improves soil nitrogen availability and microbial activity

which is helpful to further understand the soil nutrient transformation and cycling mechanism in subtropical forests under global climate change.

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