兰州大学学报(自然科学版)
蘭州大學學報(自然科學版)
란주대학학보(자연과학판)
JOURNAL OF LANZHOU UNIVERSITY
2013年
1期
76-81
,共6页
地上生物量%物种丰富度%坡向%环境因子%高寒草甸
地上生物量%物種豐富度%坡嚮%環境因子%高寒草甸
지상생물량%물충봉부도%파향%배경인자%고한초전
above ground biomass%species richness%slope aspect%environmental factor%alpine meadow
以甘南高寒草甸为对象,研究了坡向梯度上环境因子的变化特点及其与地上生物量和物种丰富度的关系.结果表明:0～20 cm与20～40 cm的土壤含水量均是自阳坡到阴坡呈递增的变化趋势,且20～40 cm土壤的含水量高于0～20 cm的;两层土壤的全磷质量分数和w(C):w(N)与含水量的变化相同,土壤全氮、有机质、速效磷及速效氮质量分数的变化均呈先减小后增大的趋势,偏阳坡最小.土壤养分质量分数均是0～20 cm的大于20～40 cm的,表现出表层土壤养分富集的现象,土壤pH值沿阳坡到阴坡呈递减趋势.地上生物量和物种丰富度的变化特点均为阴坡>偏阴坡>偏阳坡>阳坡,且地上生物量与物种丰富度显著正相关.回归分析表明:土壤含水量与土壤全磷、有机质质量分数是影响地上生物量和物种丰富度的主要因子,其中土壤含水量是关键限制性因子.
以甘南高寒草甸為對象,研究瞭坡嚮梯度上環境因子的變化特點及其與地上生物量和物種豐富度的關繫.結果錶明:0～20 cm與20～40 cm的土壤含水量均是自暘坡到陰坡呈遞增的變化趨勢,且20～40 cm土壤的含水量高于0～20 cm的;兩層土壤的全燐質量分數和w(C):w(N)與含水量的變化相同,土壤全氮、有機質、速效燐及速效氮質量分數的變化均呈先減小後增大的趨勢,偏暘坡最小.土壤養分質量分數均是0～20 cm的大于20～40 cm的,錶現齣錶層土壤養分富集的現象,土壤pH值沿暘坡到陰坡呈遞減趨勢.地上生物量和物種豐富度的變化特點均為陰坡>偏陰坡>偏暘坡>暘坡,且地上生物量與物種豐富度顯著正相關.迴歸分析錶明:土壤含水量與土壤全燐、有機質質量分數是影響地上生物量和物種豐富度的主要因子,其中土壤含水量是關鍵限製性因子.
이감남고한초전위대상,연구료파향제도상배경인자적변화특점급기여지상생물량화물충봉부도적관계.결과표명:0～20 cm여20～40 cm적토양함수량균시자양파도음파정체증적변화추세,차20～40 cm토양적함수량고우0～20 cm적;량층토양적전린질량분수화w(C):w(N)여함수량적변화상동,토양전담、유궤질、속효린급속효담질량분수적변화균정선감소후증대적추세,편양파최소.토양양분질량분수균시0～20 cm적대우20～40 cm적,표현출표층토양양분부집적현상,토양pH치연양파도음파정체감추세.지상생물량화물충봉부도적변화특점균위음파>편음파>편양파>양파,차지상생물량여물충봉부도현저정상관.회귀분석표명:토양함수량여토양전린、유궤질질량분수시영향지상생물량화물충봉부도적주요인자,기중토양함수량시관건한제성인자.
@@@@The characteristics of environmental factors with slope gradient variations and the relationship between environmental factors and above-ground biomass and species richness were studied in grasslands of Gannan alpine meadows. The results showed that the soil water content increased from sunny slopes to shady slopes in 0～20 cm and 20～40 cm soil layer, and the soil water content in 20～40 cm soil layer was higher than that of 0～20 cm. The variation trends of w(P) and soil w(C):w(N) were the same as soil water content in the two soil layers. The variation trend of the content of the total N, the organic matter, available N and available P were at first decreased and later increased, the nutrients of the partial sunny slopes being the lowest. The content of soil nutrients were all higher in 0～20 cm than that in 20～40 cm, indicating a nutrient enrichment in the surface layer. Soil pH decreased from sunny to shady slopes. The variation characteristics of above-ground biomass and species richness were shady slope>partial shady slope>partial sunny slope>sunny slope and above-ground biomass were positively correlated with species richness. The regression analysis showed that the soil water content and the content of the total P, the organic matter were the main factors that influenced above-ground biomass and species richness in grassland, the soil water content was the key limiting factor.
