华西雨屏区不同密度柳杉林下两种牧草生长效果评价  

The Growth Evaluation of Two Kinds of Forage Grass under Cryptomeria fortunei Plantations with Different Density

作　　者：綦大勇 杨长青[2] 

机构地区：[1]国有宣汉县五马林场,四川宣汉636150 [2]四川农业大学林业生态工程省级重点实验室,四川雅安625014

出　　处：《四川林业科技》2010年第3期71-74,共4页Journal of Sichuan Forestry Science and Technology

摘　　要：针对川西低山丘陵区坡耕地发展林草复合模式的需要,选择"柳杉+多年生黑麦草"和"柳杉+苇状羊茅"两种林草复合模式,研究在不同密度柳杉林(2 222株.hm-2、1 667株.hm-2、1 333株.hm-2、1 111株.hm-2)下多年生黑麦草和苇状羊茅的净光合速率、草高及生物量的变化。结果表明:(1)随着柳杉林密度的降低,两种牧草的净光合速率、草高和生物量均表现为上升趋势,但净光合速率差异均不显著(P>0.05),黑麦草草高和生物量在柳杉林各密度下差异显著(P<0.05);(2)4种柳杉林密度下,两种牧草净光合速率均为苇状羊茅>多年生黑麦草,但随着柳杉林密度的降低,两者之间差值减小;(3)4种柳杉林密度下,黑麦草草高和生物量均明显高于苇状羊茅,且随着柳杉密度的增加,差值越大。According to the development of forest-grass compound patterns in hilly regions of western Sichuan,＂Cryptomeria fortunei＋Lolium perenne＂ and ＂C.fortunei＋Festuca arundinacea＂ were selected to study the dynamics of net photosynthetic rate（Pn）,height and biomass of the two kinds of forage grass under C.fortunei plantations with different density（2 222,1 667,1 333 and 1 111 trees·hm-2）.The results indicated that：（1） The Pn,height and biomass of two kinds of forage grass increased obviously with the decrease of the C.fortunei plantation density;furthermore,the height and biomass of L.perenne displayed a significant difference（P0.5） because of the various plantation density.（2） The Pn of F.arundinacea was higher than that of L.perenne in all the plantation densities,and the difference values between two kinds of forage grass decreased along with the decreasing of the plantation density.（3） Besides,the height and biomass of L.perenne.were higher than those of F.arundinacea in all the plantation densities,and the difference values between two kinds of forage grass became greater along with the increase decreasing of the plantation density.

关 键 词：林草复合模式 柳杉 多年生黑麦草 苇状羊茅 生长情况 

分 类 号：S718.5[农业科学—林学] S54