Effects of Grazing Exclusion on Soil Nitrogen Content and Its Component Characteristics in Sagebrush Desert Grassland

HALI·Alitengbieke; SUN Zongjiu; HE Panxing; LIU Huixia

doi:10.13870/j.cnki.stbcxb.2022.06.028

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Effects of Grazing Exclusion on Soil Nitrogen Content and Its Component Characteristics in Sagebrush Desert Grassland

更新时间：2025-03-12

- Effects of Grazing Exclusion on Soil Nitrogen Content and Its Component Characteristics in Sagebrush Desert Grassland
- Vol. 36, Issue 6, Pages: 222-230(2022)
- 作者机构：
  
  1. 新疆农业大学草业学院,乌鲁木齐,830052
  2. 新疆草地资源与生态自治区重点实验室,乌鲁木齐,830052
  3. 西部干旱荒漠区草地资源与生态教育部重点实验室,乌鲁木齐,830052
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.06.028
  CLC： S812.4
- Published：2022
- 稿件说明：
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HALI·Alitengbieke, SUN Zongjiu, HE Panxing, et al. Effects of Grazing Exclusion on Soil Nitrogen Content and Its Component Characteristics in Sagebrush Desert Grassland[J]. 2022, 36(6): 222-230.
DOI：

HALI·Alitengbieke, SUN Zongjiu, HE Panxing, et al. Effects of Grazing Exclusion on Soil Nitrogen Content and Its Component Characteristics in Sagebrush Desert Grassland[J]. 2022, 36(6): 222-230. DOI： 10.13870/j.cnki.stbcxb.2022.06.028.

摘要

为探讨蒿类荒漠草地土壤氮素含量及其组分特征

采用成对试验设计

研究封育对天山北坡不同区域蒿类荒漠草地土壤全氮、碱解氮、硝态氮和铵态氮含量的影响。结果表明:(1)封育后蒿类荒漠草地0—50 cm土层土壤氮密度(0.59~0.79 kg/m2)、土壤全氮含量(0.81~1.50 g/kg)、土壤碱解氮含量(19.44~67.49 mg/kg)变化不显著(p＞0.05)。(2)封育对蒿类荒漠草地土壤硝态氮含量(6.41~21.26 mg/kg)、铵态氮含量(0.26~2.53 mg/kg)的影响因区域差异而有所不同。封育后巩留、呼图壁样地0—50 cm土层硝态氮含量依次显著降低24.61%

47.25%(p＜0.01)

而奇台样地则显著增加20.95%(p＜0.05);封育后玛纳斯样地0—50 cm土层铵态氮含量显著增加27.98%(p＜0.05)

而巩留、博乐、呼图壁样地则降低不显著(p＞0.05)。(3)蒿类荒漠草地土壤硝态氮、铵态氮含量依次占全氮量的0.27%~3.01%

0.02%~0.42%

且随土壤全氮的增加

有机氮占比增加

而无机氮、硝态氮和铵态氮占比降低。(4)相关分析表明

土壤全氮、碱解氮、硝态氮、铵态氮与有机碳、全磷呈正相关

与土壤容重、pH、电导率呈负相关

铵态氮与土壤含水量呈正相关

与速效磷呈负相关。偏冗余分析表明

土壤理化因子对土壤氮素影响的主要因子为土壤有机碳和土壤含水量

解释率依次为32.60%

17.90%。研究结果为揭示封育过程中蒿类荒漠草地土壤恢复及养分管理提供科学数据支撑。

Abstract

To explore the soil nitrogen content and composition characteristics of sagebrush desert grassland

a paired experimental design was used to study the effect of grazing exclusion on total nitrogen

alkaline hydrolyzable nitrogen

nitrate-nitrogen

and ammonium nitrogen in different regions of the northern slope of Tianshan sagebrush desert grassland. The results showed that: (1) After grazing exclusion

the soil nitrogen density (0.59~0.79 kg/m2)

soil total nitrogen (0.81~1.50 g/kg)

soil alkaline hydrolyzable nitrogen (19.44~67.49 mg/kg) did not significantly changed (p＞0.05). (2) The effects of grazing exclusion on soil nitrate-nitrogen (6.41~21.26 mg/kg) and ammonium nitrogen (0.26~2.53 mg/kg) in sagebrush desert grassland were different due to regional differences. After grazing exclusion

the content of nitrate-nitrogen in the soil layer of 0—50 cm in Gongliu and Hutubi plots decreased significantly by 24.61% and 47.25% (p＜0.01) respectively

while Qitai plots increased significantly by 20.95% (p＜0.05). After grazing exclusion

the content of ammonium nitrogen in the 0—50 cm soil layer of the Manas plot increased significantly by 27.98% (p＜0.05)

while that of the Gongliu

Bole

and Hutubi plots did not decrease significantly. (3) The contents of nitrate nitrogen and ammonium nitrogen in the soil of sagebrush desert grassland accounted for 0.27%~3.01% and 0.02%~0.42% of the total nitrogen

and with the increase of total soil nitrogen

the proportion of organic nitrogen increased

while the proportion of inorganic nitrogen

nitrate nitrogen

and ammonium nitrogen decreased. (4) Correlation analysis showed that soil total nitrogen

alkali-hydrolyzable nitrogen

nitrate-nitrogen

and ammonium nitrogen were positively correlated with organic carbon and total phosphorus

and negatively correlated with soil bulk density

and electrical conductivity

and ammonium nitrogen was correlated with soil water content. It was positively correlated and negatively correlated with available phosphorus. Partial redundancy analysis showed that the main factors influencing soil physicochemical factors on soil nitrogen were soil organic carbon and soil water content

and the explanation rates were 32.60% and 17.90% respectively. The research results provide scientific data support for revealing the soil restoration and nutrient management of sagebrush desert grassland in the process of grazing exclusion.

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