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祁连山浅山区退耕地土壤团聚体及其有机碳和全氮的分布特征
董彦丽1, 李泽霞1, 高金芳1, 张峰1, 王亚竹2, 王彦武1
1.甘肃省水土保持科学研究所, 甘肃 兰州 730020;2.甘肃省水利科学研究院, 甘肃 兰州 730000
摘要:
[目的] 分析祁连山浅山区退耕地土壤团聚体及其有机碳和全氮分布特征,为该区退耕地植被恢复及水土流失防治提供理论依据。[方法] 以祁连山大黄山林区三种类型退耕地为研究对象,通过干筛法测定团聚体粒径,分析不同粒级团聚体组成及其有机碳和全氮分布规律。[结果] 3种类型退耕地≥0.25 mm的大团聚体含量高于<0.25 mm的微团聚体,其中以 > 5 mm和0.25~2 mm粒级团聚体为主;封育草地团聚体稳定性最强,平均重量直径(MWD)高于沙棘林地9.31%,高于未封育草地31.95%;未封育草地土壤有机碳含量低于沙棘林地和封育草地,且差异显著,三种类型退耕地土壤全氮含量没有明显变化趋势;0.25~2 mm团聚体有机碳含量最高,<0.25 mm微团聚体全氮含量最高,沙棘林地和封育草地土壤团聚体养分优于未封育草地;与团聚体分布特征相同,> 5 mm和0.25~2 mm粒级团聚体依然是退耕地有机碳和全氮储存的主体。[结论] 祁连山浅山区退耕地以≥0.25 mm的大团聚体为主,沙棘林地和封育草地团聚体稳定性及其有机碳和全氮含量高于未封育草地。
关键词:  祁连山浅山区  退耕地  土壤团聚体  有机碳  全氮
DOI:10.13961/j.cnki.stbctb.2020.04.009
分类号:S152.4
基金项目:国家重点研发计划项目“西北内陆区保水节水技术集成与应用”(2017YFC0404304);甘肃省科技计划项目(18YF1FA032);甘肃省水利科学试验研究及技术推广计划项目(甘水科外发2017-76-2)
Distribution Characteristics of Soil Aggregate, Organic Carbon and Total Nitrogen in Returned Farmland in Shallow Qilian Mountains
Dong Yanli1, Li Zexia1, Gao Jinfang1, Zhang Feng1, Wang Yazhu2, Wang Yanwu1
1.Institute of Soil and Water Conservation of Gansu Province, Lanzhou, Gansu 730020, China;2.Gansu Research Institute for Water Conservancy, Lanzhou, Gansu 730000, China
Abstract:
[Objective] Distribution characteristics of soil aggregate, organic carbon and total nitrogen in returned farmland in shallow Qilian Mountains were analyzed in order to provide theoretical basis for vegetation restoration and soil erosion control in this area. [Methods] Three types of returned farmland in forest region of Dahuang Mountain were taken as the research object, soil aggregate composition were measured by dry sieving method, and the distribute of aggregates, organic carbon and total nitrogen in different level were analyzed. [Results] The content of ≥0.25 mm macro-aggregates were higher than aggregates with diameter<0.25 mm, among which, aggregates with dimeter > 5 mm and 0.25~2 mm were the main part of aggregates. The stability of the aggregate in closed grassland was the strongest, and its MWD was 9.31% higher than that of seabuckthorn forest and 31.95 % higher than that of unclosed grassland. The soil organic carbon content of unclosed grassland was lower than that of seabuckthorn forest and closed grassland, and the difference was significant. There was no significant change of total nitrogen content among the three types of returned farmland. The content of organic carbon was the highest in 0.25~2 mm aggregate, and the content of total nitrogen was the highest in <0.25 mm macro-aggregates. The nutrients of soil aggregates in seabuckthorn forest and enclosed grassland were better than that in unenclosed grassland, > 5 mm and 0.25~2 mm aggregates were still the main storage parts of organic carbon and total nitrogen in the returned farmland. [Conclusion] In shallow Qilian Mountains, ≥0.25 mm macro-aggregates were the main part. Aggregates stability, organic carbon and total nitrogen of the seabuckthorn forest and closed grassland were higher than that in the unclosed grassland.
Key words:  shallow Qilian Mountains  returned farmland  soil aggregate  organic carbon  total nitrogen