摘要
植被地上和地下生物量的分配是灌丛草地群落的重要参数,对于估算碳储量和探究灌草植被生长策略有重要意义。以冀西北中低山区(1630–2030 m)的灌丛草地为研究对象,通过野外调查采样和室内分析,研究了灌草群落生物量分配及其与土壤因子的关系。结果表明,1)地上生物量与海拔呈"单峰曲线"关系,在海拔1830–1930 m达到最大值,均值为293.90 g·m^–2,地下生物量与海拔呈"U型曲线"关系,在海拔1830–1930 m降到最小值,均值为620.07 g·m^–2。2)随着土层深度的增加,地下生物量分布呈"倒金字塔型",0–10 cm土层的地下生物量在海拔1830–1930 m和1930–2030 m间差异明显(P<0.1)。3)灌草群落生物量主要分配于地下,地下生物量为地上的6.16倍;地上生物量与土层深度20 cm和40 cm的地下生物量均在0.05水平显著负相关。4)地下生物量与土壤pH、容重在0.05水平显著负相关,与速效磷在0.01水平显著正相关。地上生物量仅与土壤pH在0.05水平显著负相关,地下与地上生物量的比值仅与土壤有机质在0.01水平显著正相关。总体上研究区灌草群落地上与地下生物量呈负相关关系(P<0.05),且地下生物量大于地上生物量。该结果可为该地区灌草群落生态恢复和生态服务提升提供科学依据。
The distribution of aboveground and belowground biomass(Belowground/Aboveground,BA)is an important parameter associated with shrubby grassland communities.It is of great significance for estimating carbon storage and studying the growth strategy of shrubby grassland communities.The shrubby grassland communities at altitudes of 1630–2030 m in the middle and low mountainous areas of Northwest Hebei Province were chosen as the research objects.This study compared and analyzed the distribution of shrub-herb community biomass and its response to soil factors through field investigation,sampling and indoor analysis.The results showed the following:1)the relationship between the aboveground biomass and altitude is a"single peak curve",reaching a maximum at altitudes of 1830–1930 m,with an average value of 293.90 g·m^–2,and the relationship between belowground biomass and altitude is defined by a"U-shaped curve",with a minimum at altitudes of 1830–1930 m,and an average value of 620.07 g·m^–2;2)the belowground biomass has an"inverted pyramid"distribution,and the belowground biomass of 0–10 cm soil layer is more different(P<0.1)in the 1830–1930 m and 1930–2030 m altitude gradients;3)the biomass of shrub-herb communities is mainly distributed underground,and the belowground biomass is 6.16 times that of the aboveground biomass,and the aboveground biomass is negatively correlated with the belowground biomass of 0–20 and 0–40 cm at 0.05 level;4)the belowground biomass is negatively correlated with soil pH and bulk density at 0.05 level,and positively correlated with available phosphorus at 0.01 level,and the aboveground biomass is negatively correlated with the pH value at 0.05 level,while the ratio of belowground biomass to aboveground biomass is positively correlated with soil organic matter at 0.01 level.Overall,there was a negative correlation between the aboveground and belowground biomass of shrub-herb communities in the study area(P<0.05),and the belowground biomass was greater than the aboveground biomass.The results of this study provide a scientific basis for improving the ecological services and ecological restoration of shrub-herb communities in the middle and low mountainous areas of the northwest Hebei Province.
作者
杜美琪
张恒硕
彭栋
查同刚
DU Meiqi;ZHANG Hengshuo;PENG Dong;ZHA Tonggang(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of State Forestry Administration on Soil and Water Conservation/Beijing Forestry University,Beijing 100083,China;Beijing Soil and Water Conservation Engineering Technology Research Center/Beijing Forestry University,Beijing 100083,China)
出处
《草业科学》
CAS
CSCD
2020年第1期1-9,共9页
Pratacultural Science
基金
国家水体污染控制与治理科技重大专项(2017ZX07101-002-002)
北京林业大学“校级大学生创新创业训练项目”(X201810022037)
关键词
冀西北中低山区
灌丛草地
海拔
群落生物量
土壤理化性质
middle and low mountainous areas of northwest Hebei Province
shrubby grassland
altitude
community biomass
physical and chemical properties
