首页|不同种植年限苜蓿地球囊霉素相关土壤蛋白含量及其影响因素

不同种植年限苜蓿地球囊霉素相关土壤蛋白含量及其影响因素

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球囊霉素相关土壤蛋白(GRSP)是丛枝菌根真菌(AMF)分泌的一种糖蛋白，有利于土壤团聚体形成。本研究借助于黄土高原半干旱区的长期定位试验，以不同建植年限(L2019、L2012、L2003)紫花苜蓿(Medicago sativa)草地为研究对象，玉米(Zea mays)田为对照，研究GRSP含量的主要调控因子及其与土壤有机碳和团聚体结构特征的关系。结果表明，随苜蓿种植年限增加，AMF丰度(侵染率、菌丝密度)和GRSP含量显著提高(P<0。05)，线性回归分析结果表明，总提取球囊霉素相关土壤蛋白(T-GRSP)含量与土壤有机碳和微生物生物量碳之间显著正相关(P<0。05)，而易提取球囊霉素相关土壤蛋白(EE-GRSP)和总提取球囊霉素土壤蛋白含量均与水稳性团粒特征平均重量直径(MWD)和大于0。25 mm的团聚体含量(R0。25)之间显著正相关(P<0。05)，冗余分析(RDA)结果表明，影响土壤AMF丰度和GRSP含量的主要环境因子是土壤速效磷(P=0。002)和微生物量碳(P=0。002)。与农田相比，T-GRSP含量在土壤有机碳中的比例随苜蓿种植年限的增加而提高，说明持续多年种植苜蓿引起GRSP含量增加，促进GRSP含量在土壤有机碳中的积累，提高了GRSP含量对土壤团聚体稳定性和有机碳的贡献。该研究结果可为黄绵土GRSP研究及紫花苜蓿栽培草地可持续利用提供理论依据。
Content and factors influencing glomalin-related soil protein of alfalfa fields at different growing ages
Glomalin-related soil protein (GRSP) originates from residual arbuscular mycorrhizal fungi (AMF), which could promote the formation of soil aggregates. This study used Zea mays farmland as the control and Medicago sativa grassland with different planting years (L2019, L2012, L2003) as the research object to analyze the main factors affecting GRSP content and the relationship between GRSP content and soil organic carbon (SOC) and aggregate characteristics through a long-term positioning experiment in the semi-arid area of the Loess Plateau. The results showed that AMF abundance (Colonization rate and Hypha density) and GRSP content significantly increased with increasing alfalfa planting years (P < 0.05). Linear regression analysis showed that Total Glomalin Related Soil Protein (T-GRSP) content positively correlated with SOC and microbial biomass carbon (P < 0.05), and that Easily Extractable Glomalin Soil Protein (EE-GRSP) content and Total Glomalin Related Soil Protein (T-GRSP) content correlated positively with mean weight diameter (MWD) and aggregate content greater than 0.25 mm (R0.25) (P < 0.05) of aggregate characteristics. Compared with Z. mays farmland, the main environmental factors affecting soil AMF abundance and GRSP content were soil-available phosphorus (P = 0.002) and microbial biomass carbon (P = 0.002). The proportion of T-GRSP in SOC was increased with an increase in M. sativa grassland planting years, indicating that continuous cultivation of M. sativa caused the increased GRSP content, promoted the accumulation of GRSP content in SOC, and improved the contribution of GRSP content to the stability of soil aggregates and organic carbon. The results can provide a reference for the study of GRSP in yellow soil and sustainable utilization of M. sativa cultivation grassland.

arbuscular mycorrhizae fungihypha densityMedicago sativamycorrhizal colonizationorganic carbonredundancy analysissoil water stable aggregate

高瑞、牛伊宁、何仁元、张耀全、海龙、罗珠珠

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甘肃农业大学资源与环境学院, 甘肃兰州 730070

省部共建干旱生境作物学国家重点实验室, 甘肃兰州 730070

紫花苜蓿 丛枝菌根真菌 有机碳 水稳性团聚体 根系菌根侵染率 菌丝密度 冗余分析

国家自然科学基金国家自然科学基金甘肃省中央财政引导地方科技发展专项甘肃省科技计划

3186036432160526ZCYD-2021-1621JR7RA830

2024

10.11829/j.issn.1001-0629.2022-0922

草业科学
中国草原学会 兰州大学草地农业科技学院

草业科学

CSTPCD北大核心
影响因子：0.854
ISSN：1001-0629
年,卷(期)：2024.41(3)
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