刘寒宇, 马 媛, 吕 杰, 林子钦, 张 帅. 古尔班通古特沙漠南缘沙垅土壤养分化学计量特征及影响因子研究[J]. 土壤通报, 2024, 55(5): 1355 − 1365. DOI: 10.19336/j.cnki.trtb.2023091703
引用本文: 刘寒宇, 马 媛, 吕 杰, 林子钦, 张 帅. 古尔班通古特沙漠南缘沙垅土壤养分化学计量特征及影响因子研究[J]. 土壤通报, 2024, 55(5): 1355 − 1365. DOI: 10.19336/j.cnki.trtb.2023091703
LIU Han-yu, MA Yuan, LÜ Jie, LIN Zi-qin, ZHANG Shuai. Stoichiometric Characteristics of Soil Nutrients and Influencing Factors in Sand Ridge on the Southern Edge of Gurbantunggut Desert, Xinjiang, China[J]. Chinese Journal of Soil Science, 2024, 55(5): 1355 − 1365. DOI: 10.19336/j.cnki.trtb.2023091703
Citation: LIU Han-yu, MA Yuan, LÜ Jie, LIN Zi-qin, ZHANG Shuai. Stoichiometric Characteristics of Soil Nutrients and Influencing Factors in Sand Ridge on the Southern Edge of Gurbantunggut Desert, Xinjiang, China[J]. Chinese Journal of Soil Science, 2024, 55(5): 1355 − 1365. DOI: 10.19336/j.cnki.trtb.2023091703

古尔班通古特沙漠南缘沙垅土壤养分化学计量特征及影响因子研究

Stoichiometric Characteristics of Soil Nutrients and Influencing Factors in Sand Ridge on the Southern Edge of Gurbantunggut Desert, Xinjiang, China

  • 摘要:
    目的 沙垅作为古尔班通古特沙漠基本地貌单元,其动态变化显著影响沙漠生态系统内植物和微生物群落分布以及土壤营养物质循环及化学计量特征。
    方法 以古尔班通古特沙漠沙垅作为研究对象,通过对沙垅不同深度(0 ~ 2 cm、2 ~ 30 cm、30 ~ 60 cm和60 ~ 100 cm)和不同位置(迎风坡垅间低地、迎风坡、垅顶、背风坡和背风坡垅间低地)土壤有机碳(SOC)、全氮(TN)、全磷(TP)和养分影响因子进行研究,阐明沙垅不同位置及不同深度土壤养分含量分布规律、生态化学计量特征和影响因素。
    结果 ①随土壤深度增加,土壤SOC、TN和TP含量呈表层富集现象,SOC和TN表层含量显著高于其他土层( P < 0.05 ),沙垅土壤养分含量沿垂直空间梯度变化显著;②不同位置0 ~ 100 cm土壤SOC、TN和TP含量沿沙垅坡向总体呈先降低后升高趋势,背风坡和垅间低地土壤养分含量较高;③沙垅土壤C∶N、C∶P和N∶P在横向和纵向上均低于中国陆地和温带沙漠平均值,养分缺乏程度表现为C > N > P;④冗余分析(RDA)结果显示,沙垅土壤养分化学计量特征主要受全钾(TK)、铵态氮(\rmNH_4^ + -N)、微生物量碳(MBC)、微生物量氮(MBN)和电导率(EC)等因素的影响。
    结论 沙垅土壤养分化学计量在水平及垂直尺度上呈现一定分布规律,不同土壤剖面养分化学计量特征的影响因子不完全一致。

     

    Abstract:
    Objective Sand ridge is the basic geomorphic unit of Gurbantunggut Desert and plays a crucial role in maintaining the stability of the desert ecological environment. Its dynamic changes can significantly affect plant and microbial communities’ distribution and soil nutrient cycling in desert ecosystems.
    Method The sand ridges of Gurbantunggut Desert were taken as the research object, soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP) and nutrient influencing factors were studied at different depths of sand ridge (0 ~ 2 cm, 2 ~ 30 cm, 30 ~ 60 cm and 60 ~ 100 cm) and different positions (interdune lowland of windward slope, windward slope, ridge top, leeward slope and interdune lowland of leeward slope). The soil nutrient content distribution patterns, ecological stoichiometric characteristics and influencing factors were investigated at different depths and positions of sand ridges.
    Results The results showed that: ① With the increase of soil depth, the soil SOC, TN and TP contents showed the phenomenon of surface enrichment, and the contents of SOC and TN in the surface layer were significantly higher than those in other soil layers ( P < 0.05). The nutrient contents of the soil in the sand ridge varied significantly along the vertical spatial gradient. ② Soil SOC, TN and TP contents in 0 ~ 100 cm at different locations showed a general trend of first decreasing and then increasing along the slope direction of the sand ridge, and soil nutrient contents were higher on the leeward slopes and in the lowland between the ridges. ③ The C∶N, C∶P and N∶P of the sandy ridge soils were lower than the average values of the Chinese land and temperate deserts both horizontally and vertically, and the degree of nutrient deficiencies was as follows: C > N > P. ④ The results of redundancy analysis (RDA) showed that the nutrient stoichiometric characteristics of sand ridge soils were mainly influenced by total potassium (TK), ammonium nitrogen (\rmNH_4^ + -N), microbial carbon (MBC), microbial nitrogen (MBN) and electrical conductivity (EC).
    Conclusion Nutrient stoichiometry of sandy ridge soils showed a certain distribution pattern on horizontal and vertical scales, and the influencing factors of nutrient stoichiometry characteristics of different soil profiles were not entirely consistent.

     

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