Effects of Land Use Type on Distribution of Glomalin-related Soil Protein in the Huixian Karst Wetland, Guilin
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摘要: 土壤丛枝菌根真菌分泌的球囊霉素相关土壤蛋白(GRSP)是土壤碳库变化的重要指标, 为明确其在会仙岩溶湿地不同土地利用方式下的分布特征及影响因素, 以会仙岩溶沼泽, 并由其转变而来的水稻田、旱地、果园和弃耕地4种不同土地利用方式为研究对象, 采集0-10 cm、10-20 cm和20-40 cm这3个层次的土样, 对不同土地利用方式下球囊霉素相关土壤蛋白分布特征及其与土壤因子的关系进行了研究。结果表明, 不同土层总球囊霉素相关土壤蛋白(T-GRSP)含量为1.08～3.35 mg/g, 占土壤有机碳的12.33%～19.73%, 球囊霉素相关土壤蛋白是湿地土壤中的一个重要碳库。球囊霉素相关土壤蛋白在不同土地利用方式和土层之间均表现出显著差异, 随土层深度的增加表现出降低趋势。沼泽土壤中总球囊霉素相关土壤蛋白、易提取球囊霉素相关土壤蛋白(EE-GRSP)含量和有机碳(SOC)的含量均高于其它4种土地利用方式(水稻田、旱地、园土和弃耕地)。GRSP分别与蛋白酶、SOC和全氮(TN)呈极显著正相关(P< 0.01), 分别与速效氮(AN)、速效磷(AP)、粘粒和粉粒呈显著正相关(P< 0.05)。EE-GRSP与SOC和TN呈极显著正相关(P< 0.01), 分别与蛋白酶和粘粒呈显著正相关(P< 0.05)。主成分分析表明, 粉粒、SOC、AN和TN是影响球囊霉素相关蛋白分布特征和反映会仙岩溶湿地土壤营养状况的主要因子。会仙岩溶湿地土壤中的球囊霉素相关土壤蛋白对土壤碳封存有重要贡献。关键词: 岩溶湿地; 球囊霉素相关土壤蛋白; 土地利用方式; 土壤蛋白酶; 土壤因子
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关键词:
- 岩溶湿地 /
- 球囊霉素相关土壤蛋白 /
- 土地利用方式 /
- 土壤蛋白酶 /
- 土壤因子
Abstract: To identify the effects of land use type on the distribution of glomalin-related soil protein in the Huixian karst wetland, we selected five land use types (marsh wetland, reclaimed paddy field, reclaimed dry farmland, orchard and abandoned land) and examined soil profile distribution patterns and influencing factors of glomalin-related soil protein. Soil samples were collected from depths of 0-10 cm, 10-20 cm, and 20-40 cm, respectively. The results showed that total glomalin-related soil protein content ranges from 1.08~3.35 mg/g, accounting for 12.33%~19.73% of soil organic carbon content. Glomalin-related soil protein is, therefore, regarded as a major carbon pool in the soil of the Huixian karst wetland. Significant differences in glomalin-related soil protein content were observed among the land use types and soil layers (P< 0.05).Glomalin-related soil protein exhibits obvious vertical distribution pattern, which decreases with an increase in soil depth. GRSP and EE-GRSP of marsh wetlands was significantly higher than the content with the other four land use types. GRSP was directly related to soil protease, soil organic carbon, and total nitrogen (P< 0.01), and had a significant positive relationship with available nitrogen, available phosphorus, clay and silt; E-GRSP was directly related to soil organic carbon and total nitrogen (P< 0.01), and had a significant positive relationship with soil protease and clay. Principal component analysis showed that silt, soil organic carbon, total nitrogen and available nitrogen were the key factors affecting distribution characteristics of glomus-associated proteins and reflected soil nutrition status in the Huixian karst wetland. Glomalin-related soil protein in soils of the Huixian karst wetland is important for soil carbon sequestration.-
Key words:
- karst wetland /
- glomalin-rated soil protein (GRSP) /
- land use type /
- soil protease /
- soil factors
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