Vertical pattern and its driving factors in soil extracellular enzyme activity and stoichiometry along mountain grassland belts
Vertical pattern and its driving factors in soil extracellular enzyme activity and stoichiometry along mountain grassland belts
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山地草原带土壤胞外酶活性和化学计量的垂直格局及其驱动因素
DOI：
10.1007/s10533-018-0499-x
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发表时间：
2018-09
期刊：
影响因子：
4
通讯作者：
Wei Wang
中科院分区：
文献类型：
--
作者：
Yiping Zuo;Jianping Li;Hui Zeng;Wei Wang
土壤胞外酶催化土壤生化过程，其活性和化学计量学的地理格局可以反映土壤微生物的功能动态。在以往的研究中，人们已经深入研究了土壤胞外酶活性的纬向和经向变化。然而，它的海拔模式和深度变化(特别是 >； 40厘米)受到的关注要少得多。在这里，我们测量了新疆维吾尔自治区垂直草原带土壤中碳(C)(β-1，4-葡萄糖苷酶)、氮(β-1，4-N-乙酰氨基葡萄糖苷酶；亮氨酸氨基肽酶)和磷(酸性磷酸酶)的潜在活性，最深可达1米。土壤在5个深度(0-10，10-20，20-40，40-60，60-100 cm)下从3个海拔梯度(低， <； 1000m；中，1000-2000m；高，2000m-3000m)采集。土壤EEA总体上随海拔升高而增大，而以微生物量C归一化的土壤EEA在中等海拔时最低。酶C/N和C/P比值均以中等海拔最高。土壤EEA随深度的增加而降低，但幅度随海拔高度的不同而不同。土壤酶化学计量学的深度变化在三个海拔梯度之间也不同。在低海拔地区，酶C/N和C/P比值只随土层深度的增加而降低。从低海拔到高海拔，N：P酶活性分别在20~40 cm、40~60 cm和0~10 cm土层中最高。土壤EEA的主要影响因素从低海拔到高海拔变化。在低海拔地区，土壤养分通过影响微生物生物量间接影响土壤EEA。在中等海拔地区，土壤水分通过pH直接或间接影响土壤EEA。在高海拔地区，只有土壤pH直接影响土壤EEA。
Soil extracellular enzymes catalyze soil biochemical processes, and the geographical patterns of their activities and stoichiometry can reflect soil microbial functional dynamics. In previous research, latitudinal and longitudinal variations in soil extracellular enzyme activity (EEA) have been intensively investigated. However, its elevation patterns and depth variations (especially > 40 cm) received much less attention. Here, we measured potential activities of enzymes of carbon (C) (β-1,4-glucosidase), nitrogen (N) (β-1,4-N-acetylglucosaminidase; leucine aminopeptidase), and phosphorus (P) (acid phosphatase) up to 1 m soil depth along a vertical grassland belt in Xinjiang Uygur Autonomous Region, China. Soils were sampled from three elevation gradients (low, < 1000 m; mid, 1000–2000 m; high, 2000–3000 m) at five depths (0–10, 10–20, 20–40, 40–60, 60–100 cm). Soil EEA generally increased with elevation, while specific EEA normalized by microbial biomass C was lowest at mid-elevation. Both enzymatic C:N and C:P ratios were highest at mid-elevation. Soil EEA declined with depth but the extents varied with elevation. Depth variations in soil enzymatic stoichiometry also differed among three elevation gradients. Enzyme C:N and C:P ratios only decreased with soil depth at low elevation. From low to high elevation, enzyme N:P was highest at depths of 20–40 cm, 40–60 cm, and 0–10 cm, respectively. Key influential factors of soil EEA varied from low to high elevation. At low elevation, soil nutrient affected soil EEA indirectly through affecting microbial biomass. At mid-elevation, soil moisture influenced soil EEA directly and indirectly via pH. At high elevation, only soil pH impacted soil EEA directly.
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