貢嘎山垂直帶林分凋落物及研究(文件)
【正文】 累并不多。 表7 貢嘎山東坡海拔3580m峨眉冷杉林年凋落量及其組分（kg雖然林分的凋落量較高，但枯葉中N、P、K和有機碳含量并不高，所以，峨眉冷杉凋落物中N、P、K和有機碳年歸還量較低。Reiners等人認為最初凋落物量隨海拔升高迅速減少[7]，以后變化幅度大大減小，但是，隨著海拔的升高，凋落物量呈下降趨勢。將暗針葉林凋落物中針葉的元素含量與常綠與落葉闊葉混交林的進行比較發(fā)現(xiàn)，針葉N平均含量較低，闊葉N含量較高，在生長季各月常綠闊葉中N含量變化趨勢與落葉闊葉和針葉的呈明顯相反變化趨勢；落葉闊葉P平均含量較高，而常綠的闊葉和針葉P平均含量較低，在生長季各月常綠闊葉中P含量變化趨勢與落葉闊葉和針葉的呈明顯相反變化趨勢；落葉闊葉K平均含量很高，常綠闊葉K平均含量較高，而針葉K平均含量較低。參考文獻[1]Bray J R amp。hm2a1, respectively. Litterfall concentration of mineral elements was lower than that of fresh foliage, due to resorption during senescence. The resorbtion rates of N, P and K in the leaf by senescence in the evergreen and deciduous broadleaf forest were the least than that in the Abies fabri forests. The large biomass and the slow nutrient elements turnover characteristic of the Abies fabri forest indicate low resilience and one would therefore expect slow recovery of the forestKey words Gongga Mountain, Abies fabri forest, Litterfall 。 nutrient elements returned to soil of N,P,K averaged , and kg Long G in litterfall along a gradient in altitude[J].,75: 629~638.[8]Nye P H. Organic matter and nutrient cycles under moist tropical forest[J]. Plant and , 13:333~346.CHARACTERISTIC OF FORESTS LITTERFALL ALONG VERTICAL SPECTRUM ON THE GONGGA MOUNTAINLUO Ji CHENG Gengwei CHEN Binru Li Wei(Institute of Mountain Hazards and Environment, Chinese Academy of Sciences amp。常綠與落葉闊葉混交林K回流較高，但是營養(yǎng)元素回流的總量并不高，峨眉冷杉的針葉N回流較多,營養(yǎng)元素回流的總量也較高，而每年以凋落物方式歸還的礦質(zhì)元最少。若考慮到這些因素，貢嘎山東坡從海拔2200m至3580m天然林的凋落物總量有明顯減少的趨勢。 hm2 hm2 hm2（表7），％，枯葉中的灌木杜鵑葉占有一定比例，%，其它灌木成分很少。 表6 峨眉冷杉林凋落物元素歸還量（kg a1，這種結(jié)果不僅是的峨眉冷杉林年凋落量較少的原因， %的針葉N、K含量明顯比常綠與落葉闊葉混交林的闊葉少，N含量約少一半。生長季中針葉的N、P、K含量逐
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1