滇西并流河谷区土壤酶活性化学计量学特征与环境因子的关系

doi:10.13287/j.1001-9332.202104.009

应用生态学报 ›› 2021, Vol. 32 ›› Issue (4): 1269-1278.doi: 10.13287/j.1001-9332.202104.009

滇西并流河谷区土壤酶活性化学计量学特征与环境因子的关系

孙毅^1,2, 和润莲^1,2, 何光熊^1,2, 张梦寅³, 方海东^1,2, 史亮涛^1,2, 闫帮国^1,2*

¹云南省农业科学院热区生态农业研究所, 云南元谋 651300;
²元谋干热河谷植物园, 云南元谋 651300;
³云南省农业科学院经济作物研究所, 昆明 650205

收稿日期:2020-10-12 接受日期:2021-02-01 发布日期:2021-10-25
通讯作者: *E-mail: ybg@yaas.org.cn
作者简介:孙毅, 男, 1991年生, 硕士研究生。主要从事植物与土壤互作研究。E-mail: eco31@qq.com
基金资助:
云南省重点研发项目(2019BC001)和国家自然科学基金项目(31460127)资助

Relationships between stoichiometric characteristics of soil enzymatic activities and environmental factors in parallel valleys of western Yunnan, China.

SUN Yi^1,2, HE Run-lian^1,2, HE Guang-xiong^1,2, ZHANG Meng-yin³, FANG Hai-dong^1,2, SHI Liang-tao^1,2, YAN Bang-guo^1,2*

¹Tropical Eco-agriculture Research Institute, Yunnan Academy of Agricultural Sciences, Yuanmou 651300, Yunnan, China;
²Yuanmou Dry-hot Valley Botanical Garden, Yuanmou 651300, Yunnan, China;
³Industrial Crops Research Institute, Yunnan Academy of Agricultural Sciences, Kunming 650205, China

Received:2020-10-12 Accepted:2021-02-01 Published:2021-10-25
Contact: *E-mail: ybg@yaas.org.cn
Supported by:
Key R&D Program of Yunnan Province (2019BC001) and the National Natural Science Foundation of China (31460127).

摘要/Abstract

摘要： 横断山河谷区具有极高的景观异质性,气候与植被类型多样化程度较高。为探讨土壤C、N、P、S四种生物元素在滇西怒江、澜沧江、金沙江及元江并流河谷区的区域循环特征,在各河谷的森林、草地、农田中分别取浅层(0～10 cm)土样,测定了土壤中C、N、P、S的循环酶,即β-葡萄糖苷酶(BG)、N-乙酰-β-D-氨基葡萄糖苷酶(NAG)、酸性磷酸酶(AP)、硫酸脂酶(SU)活性,分析了土壤酶活性及其化学计量学特征与环境因素之间的关系。结果表明: 不同流域和不同土地类型下AP、NAG活性均有显著差异;4种酶活性之间均呈显著正相关,BG、NAG、SU活性由东南向西北随采样点的海拔升高而逐渐升高;在各流域土壤中,酶活性的生态化学计量比均为AP∶SU > BG∶SU > NAG∶SU > BG∶NAG > BG∶AP > NAG∶AP;与各流域内的林地和草地相比,农田土壤BG∶NAG较高,而NAG∶AP较低(元江流域除外);农田土壤中AP∶SU、BG∶SU、NAG∶SU在元江流域小于草地和林地,在澜沧江流域和金沙江流域则大于林地而小于草地。土壤酶活性及其化学计量学特征受到土壤理化性质、气候及区位的综合影响,其中土壤理化性质的影响最大。农业活动对C∶N∶P相关酶化学计量学特征具有显著影响,降低了土壤中N分解酶与其他酶活性的计量比,表现为增加了BG∶NAG,降低了NAG∶AP,农业活动对其他酶化学计量学特征的影响较小。

关键词: 横断山, 土壤酶活性, 酸性磷酸酶, β-葡萄糖苷酶, N-乙酰-β-D-氨基葡萄糖苷酶, 硫酸脂酶

Abstract: The valleyes of Hengduan Mountains contain the landscapes with high heterogeneity as well as high diversity of climate and vegetation types. To explore the soil cycling of four elements (C, N, P, S) across the parallel valleys of Nujiang River, Lancang River, Jinsha River and Yuanjiang River in western Yunnan, we collected top soils (0-10 cm) in forests, grasslands, and croplands. The activities of soil enzymes, including β-glucosidase (BG), β-N-acetylglucosaminidase (NAG), acid phosphatase (AP), and sulfatase (SU), which drive the soil C, N, P and S cycling, were determined. We analyzed the relationships of soil enzymatic activities and their stoichiometric characteristics with environmental factors. The activities of both AP and NAG had significant difference among different basins and different land types. The activities of AP, BG, NAG and SU were significantly positively related with each other. From southeast to northwest, the activities of BG, NAG, and SU increased with the altitude. Across all basins, the ecoenzymatic ratios of soils always ranked as AP:SU > BG:SU > NAG:SU > BG:NAG > BG:AP > NAG:AP. Compared with forest and grassland soil, cropland soils in each watershed had a higher BG:NAG and a lower NAG:AP (except Yuanjiang River basin). Moreover, AP:SU, BG:SU and NAG:SU of cropland soils were lower than those of forest and grassland in Yuanjiang River basin. However, they were higher than forest and lower than grassland in both Lancang River basin and Jinsha River basin. Soil enzyme activities and enzymatic stoichiometry were affected by physicochemical properties of soil, climate, and location, with the most contribution from soil physicochemical properties. Agricultural land use significantly affected the stoichiometry of C:N:P acquiring enzymes in soils by reducing the activity of N-degrading enzymes relative, resulting in the increases of BG:NAG and the decreases of NAG:AP. Agricultural activities had limited effects on other enzymatic stoichiometries.

Key words: Hengduan Mountains, soil enzyme activity, acid phosphatase, β-glucosidase, β-N-acetylglucosaminidase, sulfatase

孙毅, 和润莲, 何光熊, 张梦寅, 方海东, 史亮涛, 闫帮国. 滇西并流河谷区土壤酶活性化学计量学特征与环境因子的关系[J]. 应用生态学报, 2021, 32(4): 1269-1278.

SUN Yi, HE Run-lian, HE Guang-xiong, ZHANG Meng-yin, FANG Hai-dong, SHI Liang-tao, YAN Bang-guo. Relationships between stoichiometric characteristics of soil enzymatic activities and environmental factors in parallel valleys of western Yunnan, China.[J]. Chinese Journal of Applied Ecology, 2021, 32(4): 1269-1278.

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滇西并流河谷区土壤酶活性化学计量学特征与环境因子的关系

Relationships between stoichiometric characteristics of soil enzymatic activities and environmental factors in parallel valleys of western Yunnan, China.

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