Latitudinal and depth patterns of soil microbial biomass carbon, nitrogen, and phosphorus in grasslands of an agro-pastoral ecotone
Latitudinal and depth patterns of soil microbial biomass carbon, nitrogen, and phosphorus in grasslands of an agro-pastoral ecotone
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DOI：
10.1002/ldr.3978
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发表时间：
2021-05-24
影响因子：
4.7
通讯作者：
Wang, Wei
中科院分区：
文献类型：
--
作者：
Chen, Xinyue;Zhang, Hongjin;Wang, Wei
土壤微生物生物量是生态系统功能管理的关键土壤驱动因素。然而，很少有人知道的微生物生物量的空间分布在频繁干扰的地区，如农牧交错带。在这项研究中，我们在中国北方农牧交错带的56个地点的天然草地上采集了0-10和10-20 cm土壤深度的土壤样品。我们测量了微生物生物量碳（MBC），氮（MBN），磷（MBP）和可能的驱动程序的响应。在区域尺度上，MBC和MBP均与纬度呈显著正相关，而MBN则表现出不显著的纬度分布模式，与土壤深度无关。影响MBC和MBN纬向分布的主要因子是土壤全碳含量（STC）、土壤全氮含量（NO3）和土壤水分，而MBP纬向分布则受NO3、土壤pH和年平均温度的影响。随着土壤深度的增加，土壤微生物量碳、微生物量氮和微生物量磷分别下降了37.4%、32.8%和21.5%。有趣的是，当微生物生物量由STC，NPO和土壤全磷含量（STP）归一化时，MBC/STC仍显着下降，而MBN/NPO没有显着差异，MBP/STP显着增加土壤深度。MBC、MBN和MBP深度分布的影响因素是土壤基质（如STC、STP和STC）。本研究结果有助于了解频繁干扰区土壤微生物生物量的空间格局及其影响因素。
Soil microbial biomass is a key soil driver in the management of ecosystem functioning. However, little is known about the spatial distribution of microbial biomass in frequently disturbed areas, such as agro-pastoral ecotones. In this study, we sampled soil from natural grasslands across 56 sites in the agro-pastoral ecotone of northern China at 0-10 and 10-20 cm soil depth. We measured microbial biomass carbon (MBC), nitrogen (MBN), and phosphorus (MBP) and possible drivers of responses. Both MBC and MBP showed a significant positive relationship with latitude at the regional scale, whereas MBN showed a non-significant latitudinal pattern, independent of soil depth. The major influential factors for the latitudinal pattern of both MBC and MBN were soil total carbon content (STC), soil total nitrogen content (STN), and soil moisture, while the latitudinal pattern of MBP was influenced by STN, soil pH and mean annual temperature. Furthermore, MBC, MBN, and MBP decreased with increasing soil depth by 37.4%, 32.8%, and 21.5%, respectively. Interestingly, when microbial biomass was normalized by STC, STN, and soil total phosphorous content (STP), MBC/STC still significantly declined, whereas MBN/STN showed no significant difference and MBP/STP significantly increased with soil depth. The influential factor for the depth patterns of MBC, MBN, and MBP was soil substrate (as indicated by STC, STN, and STP). The findings of this study are helpful in understanding the spatial pattern of microbial biomass and its influencing factors in frequently disturbed areas.