橡胶林下间作广金钱草地上部碳氮磷钾生态化学计量特征研究

摘要

The effect of different shade intensity on C,N,P,K ecologicalstoichiometry in Desmodium styracifolium that intercropped under different rubber plantations were studied in this paper.Results showed that:(1)C and N content,N/P,C/P all showed leave＞above-ground＞stem,but P and K content、C/N all showed stem＞aboveground＞leave.(2)C content all declined when shade intensity increased.(3)Leaf N and every part's P all showed medium shade＞natural light and more shade＞highly shade,above-ground N showed just the oppositely,but in stem N their were natural light＞more shade and highly shade＞medium shade.(4) Stem K and above-ground K all declined when shade intensity increased,but leaf K showed medium shade＞more shade and highly shade＞natural light.(5) Every part's N/P all showed increased when shade intensity increased.(6)Above-ground and stem C/N all showed medium shade＞natural light and more shade＞highly shade,but leaf C/N showed natural light and more shade＞medium shade and highly shade.(7)Every part's C/P all showed highly shade＞more shade and natural light＞medium shade.%为了解不同荫蔽度对橡胶林下间作广金钱草中碳氮磷钾元素含量的影响,对不同橡胶林下间作广金钱草地上部碳氮磷钾的生态化学计量特征进行比较研究.结果表明:(1)各处理C和N含量、N/P及C/P均为:叶片＞地上部＞茎,P和K含量、C/N均为:茎＞地上部＞叶片;(2)各部位C含量均随荫蔽度的增加而降低;(3)叶片N和各部位P含量均为:中等荫蔽＞全自然光照、较高荫蔽＞高度荫蔽处理,地上部N则与之刚好相反,而茎中的N含量为:全自然光照＞较高荫蔽、高度荫蔽＞中等荫蔽处理;(4)茎K、地上部K含量均随荫蔽度增加而降低,但叶片K为:中等荫蔽＞较高荫蔽、高度荫蔽＞全自然光照处理;(5)各部位N/P均随荫蔽度增加而增加:(6)地上部、茎中的C/N均为:中等荫蔽＞全自然光照、较高荫蔽＞高度荫蔽处理,但叶片中C/N为:全自然光照、较高荫蔽＞中等荫蔽和高度荫蔽处理;(7)各处理C/P均为:高度荫蔽＞较高荫蔽、全自然光照＞中等荫蔽处理.林下不同荫蔽度可对橡胶林下间作广金钱草地上部的C、N、P、K的生态化学计量特征产生较大影响.