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放牧影响下克氏针茅草原不同物候期土壤酶活性与微生物生物量的变化

徐志超1,宋彦涛1,乌云娜1*,霍光伟1,王晓朦1,道日娜1,2
  

  1. 1大连民族大学环境与资源学院, 辽宁大连 116600; 2内蒙古大学生命科学学院, 呼和浩特 010000)
  • 出版日期:2016-08-10 发布日期:2016-08-10

Effect of grazing intensities on soil enzyme activities and soil microbial biomass of Stipa krylovii steppe in different phenological periods.

XU Zhi-chao1, SONG Yan-tao1, WU Yunna1*, HUO Guang-wei1, WANG Xiao-meng1, DAO Ri-na1,2#br#   

  1. (1College of Environment and Resources, Dalian Nationalities University, Dalian 116600, Liaoning, China; 2College of Life Science, Inner Mongolia University, Hohhot 010000, China).
  • Online:2016-08-10 Published:2016-08-10

摘要: 研究了内蒙古呼伦贝尔克氏针茅草原不同放牧强度下土壤脲酶、脱氢酶、蔗糖酶、过氧化氢酶活性及土壤微生物生物量在不同物候期的动态变化。结果表明,返青期、抽穗期、开花期及种子成熟期中度放牧区土壤脱氢酶活性显著高于轻度放牧区(P<0.05);返青期、抽穗期、开花期以及种子成熟期,轻度、中度放牧土壤中过氧化氢酶活性显著高于重度放牧梯度(P<0.05)。轻度放牧区土壤微生物生物量碳在种子成熟期显著高于抽穗期(P<0.05),土壤微生物生物量氮在抽穗期及种子成熟期显著高于返青期、开花期(P<0.05);中度放牧区土壤微生物生物量碳在返青期显著高于抽穗期、开花期及种子成熟期(P<0.05),土壤微生物生物量氮在返青期显著高于抽穗期、开花期及种子成熟期(P<0.05);重度放牧区种子成熟期土壤微生物生物量碳显著高于返青期、抽穗期及开花期(P<0.05),种子成熟期土壤微生物生物量氮显著高于返青期、抽穗期及开花期(P<0.05)。相关性分析表明,土壤过氧化氢酶活性与土壤微生物生物量氮呈显著正相关,土壤微生物生物量碳与微生物生物量氮呈极显著正相关。

关键词: 生态需水量, 水文变异, 荆南三口

Abstract: The effects of grazing intensities on soil enzyme activities (urease, dehydrogenase, sucrase, catalase) and soil microbial biomass were studied in a Stipa krylovii steppe in Hulunbuir of Inner Mongolia during different phenological periods. The results showed that soil dehydrogenase activity in moderately grazed plots was significantly higher than that in lightly grazed plots in periods of seedling establishment, heading, flowering and seed maturation (P<0.05). Catalase activity in lightly and moderately grazed plots was significantly higher than in heavy grazed plots in periods of seedling establishment, heading, flowering and seed maturation (P<0.05). Under the light grazing, soil microbial biomass carbon was significantly lower in heading period than in seed maturation period (P<0.05), and soil microbial biomass nitrogen was significantly higher in heading and seed maturation periods than in seedling establishment and flowering periods (P<0.05). Under moderate grazing, soil microbial biomass carbon was significantly higher in seedling establishment than in heading, flowering and seed maturation periods (P<0.05), and soil microbial biomass nitrogen was significantly higher in seedling establishment period than in heading, flowering and seed maturation periods (P<0.05). Under heavy grazing, soil microbial biomass carbon was significantly higher in seed maturation period than in seedling establishment, heading and flowering periods (P<0.05), and soil microbial biomass nitrogen was significantly higher in seed maturation period than in seedling establishment, heading and flowering periods (P<0.05). Correlation analysis showed that soil catalase activity was positively correlated with soil microbial biomass nitrogen, and soil microbial biomass carbon was positively correlated with soil microbial biomass nitrogen.

Key words: ecological water demand, hydrological variation, the southern three outlets of Jingjiang River.