封育和水平沟生态恢复措施对宁夏黄土丘陵区典型草原土壤生物学特性的影响
发布时间：2018-08-27 10:52
【摘要】：研究禁牧封育和水平沟生态恢复措施下黄土丘陵区典型草原土壤生物学特性变化,以期为该区草地生态建设提供依据。采用空间梯度代替时间梯度的方法,在宁夏黄土丘陵区典型草原,选取未封育(放牧)、封育3~15a、水平沟整地后1~15a的土壤,分析0—10,10—20,20—30,30—40cm土壤微生物数量、微生物生物量碳、量氮和土壤酶活性的变化特征及其相关性。结果表明:(1)试验区土壤微生物类群以放线菌为主,达到86.18%~94.43%,数量表现为放线菌细菌真菌,土壤微生物总数、细菌和放线菌数、微生物生物量碳、量氮含量,脲酶、蛋白酶、磷酸酶、蔗糖酶活性随着草地封育年限增加呈上升变化,但水平沟措施下随着整地年限延长呈上升—下降—上升的趋势,2种措施下土壤过氧化氢酶活性变化趋势与其他指标相反,真菌数在封育6a和水平沟6a较低,分别为11.33,4.67cfu/g;(2)各处理下,0—40cm土壤微生物和酶活性整体呈现上层土壤高于下层土壤,土壤微生物、酶活性与有机碳等主要养分含量相关性显著(p0.05);(3)相近恢复年限下,土壤微生物数量、微生物生物量碳、微生物生物量氮以及酶活性总体为封育草地高于水平沟(p0.05);研究认为,禁牧封育较水平沟措施更有利于黄土丘陵区典型草原土壤微生物和酶活性的增加。
[Abstract]:The changes of soil biological characteristics of typical steppe in loess hilly region under the measures of closed grazing and horizontal ditch ecological restoration were studied in order to provide the basis for the ecological construction of grassland in this area. Using spatial gradient instead of time gradient, the soil was selected in Ningxia Loess Hilly region, which was not fenced (grazing), closed for 3 ~ 15 years, and 1 ~ 15 years after horizontal ditch preparation. The soil microbial quantity of 0-10 ~ (-10) ~ (-20) ~ (-20) ~ (20) ~ (30) ~ (30) ~ (30) ~ (30) ~ (40) cm soil was analyzed. Changes of microbial biomass carbon, nitrogen and soil enzyme activity and their correlation. The results showed that: (1) Actinomycetes dominated by actinomycetes and reached 86.18 ~ 94.43. The number of actinomycetes, the total number of soil microbes, the number of bacteria and actinomycetes, microbial biomass carbon, nitrogen content, urease, protease, soil actinomycetes, urease, protease The activities of phosphatase and sucrase increased with the increase of hermetic years. However, the soil catalase activity under the horizontal ditch treatment increased, decreased and increased with the increase of land preparation years. The change trend of soil catalase activity was opposite to that of other indexes, and the number of fungi was lower at 6 years of fencing and 6 years of horizontal ditch. (2) soil microorganism and enzyme activity in 0-40cm soil were higher than that in lower soil, and soil microorganism, enzyme activity and organic carbon had significant correlation (p0.05); (_ 3), the soil microbial quantity was significant (p0.05); (_ 3), and the soil microbe activity was higher than that in the lower soil (p0.05); (_ 3), and the soil microbial activity was higher than that in the lower soil (p0.05); (_ 3). Microbial biomass carbon, microbial biomass nitrogen and enzyme activity were generally higher in fenced grassland than in horizontal ditch (p0.05).
【作者单位】： 宁夏大学农学院;宁夏大学西北土地退化与生态恢复国家重点实验室培育基地;
【基金】：国家自然科学基金项目(31460632) 中国科学院西部之光人才培养引进计划项目(XAB2015A10)
【分类号】：S812.2
本文编号：2207053
[Abstract]:The changes of soil biological characteristics of typical steppe in loess hilly region under the measures of closed grazing and horizontal ditch ecological restoration were studied in order to provide the basis for the ecological construction of grassland in this area. Using spatial gradient instead of time gradient, the soil was selected in Ningxia Loess Hilly region, which was not fenced (grazing), closed for 3 ~ 15 years, and 1 ~ 15 years after horizontal ditch preparation. The soil microbial quantity of 0-10 ~ (-10) ~ (-20) ~ (-20) ~ (20) ~ (30) ~ (30) ~ (30) ~ (30) ~ (40) cm soil was analyzed. Changes of microbial biomass carbon, nitrogen and soil enzyme activity and their correlation. The results showed that: (1) Actinomycetes dominated by actinomycetes and reached 86.18 ~ 94.43. The number of actinomycetes, the total number of soil microbes, the number of bacteria and actinomycetes, microbial biomass carbon, nitrogen content, urease, protease, soil actinomycetes, urease, protease The activities of phosphatase and sucrase increased with the increase of hermetic years. However, the soil catalase activity under the horizontal ditch treatment increased, decreased and increased with the increase of land preparation years. The change trend of soil catalase activity was opposite to that of other indexes, and the number of fungi was lower at 6 years of fencing and 6 years of horizontal ditch. (2) soil microorganism and enzyme activity in 0-40cm soil were higher than that in lower soil, and soil microorganism, enzyme activity and organic carbon had significant correlation (p0.05); (_ 3), the soil microbial quantity was significant (p0.05); (_ 3), and the soil microbe activity was higher than that in the lower soil (p0.05); (_ 3), and the soil microbial activity was higher than that in the lower soil (p0.05); (_ 3). Microbial biomass carbon, microbial biomass nitrogen and enzyme activity were generally higher in fenced grassland than in horizontal ditch (p0.05).
【作者单位】： 宁夏大学农学院;宁夏大学西北土地退化与生态恢复国家重点实验室培育基地;
【基金】：国家自然科学基金项目(31460632) 中国科学院西部之光人才培养引进计划项目(XAB2015A10)
【分类号】：S812.2
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