遮荫对紫花苜蓿地上生物量和化学计量特征的影响  

Effects of shading on the aboveground biomass and stiochiometry characteristics of Medicago sativa

作　　者：马志良[1] 杨万勤[1] 吴福忠[1] 高顺[1] 

机构地区：[1]四川农业大学生态林业研究所林业生态工程重点实验室,成都611130

出　　处：《应用生态学报》2014年第11期3139-3144,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(3117023;31200474;31270498);"十二五"国家科技支撑计划项目(2011BAC09B05);四川省杰出青年学术与技术带头人培育项目(2012JQ0008;012JQ0059);中国博士后科学基金项目(7013M540714;2012T50782)资助

摘　　要：采用遮荫试验模拟林地不同光照强度,研究紫花苜蓿地上生物量和C、N、P、K化学计量特征,为撂荒地林下间种苜蓿提供科学依据.结果表明:苜蓿地上生物量与光照强度呈显著正相关,遮荫处理显著降低了苜蓿地上生物量;62%遮荫处理下全C、N、P含量最高,分别为373.73、34.38和5.47 g·kg-1,并且显著高于对照.遮荫对苜蓿地上部分K含量影响不显著.除72%遮荫处理下C/N显著高于对照外,其他各处理与对照差异不显著.N/P、C/P随遮荫强度增加呈先降低后升高的趋势.In order to provide scientific basis for inter-planting alfalfa in abandoned farmland, a shading experiment was conducted to simulate the effects of different light intensities on the aboveground biomass, the contents of carbon, nitrogen, phosphorus and potassium, and the stoi- ehiometric characteristics of alfalfa under the plantation. The results showed that the aboveground biomass of alfalfa correlated significantly with the light intensity, and shading treatment reduced the aboveground biomass of alfalfa significantly. The aboveground alfalfa tissues under the 62% shading treatment had the highest contents of carbon, nitrogen and phosphorus, which was 373.73, 34.38 and 5.47 g·kg^-1, respectively, and significantly higher than those of the control. However, shading treatments had no significant effect on the potassium content of aboveground part. The C/N ratio in aboveground tissues under the 72% shading treatment was significantly higher than that of the control, but no significant differences among other treatments were found. The ratios of N/P and C/P in aboveground tissues showed a tendency that decreased firstly and then increased with the increase of light intensity.

关 键 词：遮荫 紫花苜蓿 地上生物量 化学计量特征 

分 类 号：S541.9[农业科学—作物学]