文章摘要
周世璇, 李鹏, 张祎, 马田田.黄土高原小流域不同生态建设措施下土壤水稳性团聚体及其全氮分布特征[J].水土保持学报,2021,35(3):119~126,134
黄土高原小流域不同生态建设措施下土壤水稳性团聚体及其全氮分布特征
Distribution Characteristics of Soil Water-stable Aggregates and Total Nitrogen Under Different Ecological Construction Measures in a Small Watershed on the Loess Plateau
投稿时间:2020-10-29  
DOI:10.13870/j.cnki.stbcxb.2021.03.017
中文关键词: 黄土高原  生态建设  土壤团聚体  土壤TN  贡献率
英文关键词: Loess Plateau  ecological construction  soil aggregates  total soil nitrogen  contribution rate
基金项目:国家重点研发计划项目(2016YFC0402404);陕西省创新人才推进计划项目科技(水土资源环境演变与调控)创新团队(2018TD-037)
作者单位E-mail
周世璇1,2, 李鹏1,2, 张祎1,2, 马田田1,2 1. 西安理工大学省部共建西北旱区生态水利国家重点实验室, 西安 710048

2. 旱区生态水文与侵蚀灾害防治国家林业和草原局重点实验室
, 西安 710048 
lipeng74@163.com 
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中文摘要:
      全氮(TN)作为土壤团聚体形成的胶结物质之一,能加速不同粒级团聚体之间的转化。以黄土高原王茂沟小流域为研究对象,采用"S"法及挖剖面法对坡耕地、草地、灌木地、林地及梯田0—60 cm土壤进行分层取样,以坡耕地为对照,探究4种生态建设下土壤团聚体稳定性及其TN含量,分析不同深度(0—20,20—40,40—60 cm)、不同粒级(>5,5~2,2~1,1~0.5,0.5~0.25,<0.25 mm)土壤团聚体TN贡献率。结果表明:生态建设显著提高了土壤大团聚体含量,其中草地、林地与坡耕地相比,表层土壤>5 mm团聚体分别增加469%和438%,土壤团聚体稳定性(MWD、GMD)增加,在垂直方向上则表现为团聚体稳定性随土层深度增加而降低。较之坡耕地,草地、灌木地、林地及梯田可在不同程度上提高土壤团聚体TN含量,其中林地团聚体TN储量(36.53 kg/m2)最高,灌木地(32.12 kg/m2)、草地(20.30 kg/m2)及梯田(18.62 kg/m2) TN储量较坡耕地分别增加131%,46%,34%,随着土层深度增加,不同生态建设类型对团聚体TN含量的影响逐渐弱化。随着坡耕地-草地-灌木地-林地的自然演替过程,<0.25 mm团聚体TN贡献率呈降低趋势,梯田能够在一定程度上改良坡耕地的土壤结构,粒径范围在5~0.25 mm的土壤团聚体TN含量近乎达到草地的恢复水平,但>5 mm团聚体的恢复空间尚且较大。
英文摘要:
      Total nitrogen (TN), as one of the cementing substances formed by soil aggregates, can accelerate the transformation among aggregates with different particle sizes. Taking the Wangmaogou small watershed in the Loess Plateau as the research object, the "S" method and the digging section method were used to sample the 0-60 cm soil of slope farmland, grassland, shrubland, forest and terraces. The slope farmland was used as a control to explore the stability of soil aggregates and their TN content under four ecological constructions. The TN contribution rates of soil aggregates were analyzed for different depths (0-20, 20-40, 40-60 cm) and different particle sizes (> 5, 5~2, 2~1, 1~0.5, 0.5~0.25, < 0.25 mm). The results showed that ecological construction significantly increased the content of large soil aggregates. Compared with grassland and forest, the aggregates of > 5 mm in the surface soil were increased by 469% and 438% respectively, and the stability of soil aggregates (MWD, GMD) were increased. In the vertical direction, the stability of the aggregates decreased with the increasing depth. Compared with sloping farmland, grassland, shrubland, forest and terraces could increase the TN content of soil aggregates to varying degrees. Among them, forest aggregates had the highest TN reserves (36.53 kg/m2), and the TN reserves in the shrubland (32.12 kg/m2), grassland (20.30 kg/m2) and terraces (18.62 kg/m2) were increased by 131%, 46% and 34% respectively compared with slope farmland. With the increase of soil depth, the influence of different ecological construction types on aggregate TN content gradually was weakened. With the natural succession process of sloping farmland-grassland-shrubland-forest, the contribution rate of TN by aggregates of < 0.25 mm showed a decreasing trend. Terraced fields could improve the soil structure of sloping farmland to a certain extent. With the particle size range of 5~0.25 mm, the TN content of soil aggregates could reach the level of grassland recovery, but the aggregates of > 5 mm had still relatively large space for recovery.
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