池杉林网营养元素贮量、归还及释放  

Accumulation, Return and Release of Nutrient Elements in Taxodium Network of Pearl River Delta

作　　者：周毅[1] 卢国桓 

机构地区：[1]广东省林业科学研究院,广东广州510520 [2]广东省江门市新会区林业局,广东新会529100

出　　处：《中南林学院学报》2004年第4期37-40,共4页Journal of Central South Forestry University

基　　金：广东省科技攻关项目(编号:2002C20703);广东省林业局项目"生态林效益检测及信息系统建设"的部分内容.

摘　　要：　对珠江三角洲8年生池杉Taxodiumascendens林网中N、P、K、Ca、Mg、Na、Cl等7种元素的贮量、归还、释放进行了研究.结果表明:8年生池杉林网中N、P、K、Ca、Mg、Na、Cl7种元素的贮量分别为352.84、62.96、116.23、333.16、47.51、110.45、127.67kg·hm-2,池杉各器官中以树干的贮量最大,土壤层0～40cm中7种元素的贮量分别为555.91、54.64、586.72、11629.04、9943.50、655.03、934.91kg·hm-2,以Ca、Mg、Cl的贮量为较高;8年生池杉年凋落量较大,达3586.70kg·hm-2,凋落物干物质年失重率达57.48%,凋落物中7种元素的年归还量分别为38.70、4.95、22.49、38.05、29.63、10.51、39.78kg·hm-2,年释放率分别为56.67%、73.91%、92.68%、62.52%、98.79%、88.44%、98.20%,释放量分别为21.91、3.65、20.82、23.79、29.26、9.32、39.08kg·hm-2;池杉凋落物在凋落180d之后才有比较快的分解.The experiment was conducted on the 8-year-old Taxodium stand network in Pearl River delta; the accumulation, return and release of the main 7 nutrient elements (N, P, K, Ca, Mg, Na, Cl) of the network ecosystem were measured. The results show:the concentration of the 7 elements is the highest in leaf and the lowest in bole; the accumulation of the 7 elements reaches 1 150.82 kg·hm^(-2): they are 352.84 kg·hm^(-2) of N, 62.96 kg·hm^(-2) of P and 116.23, 333.16, 47.51, 110.45, 127.67 kg·hm^(-2) of K, Ca, Mg, Na, Cl respectively, which can be put in the order as N>Ca>Cl>K>Na>Mg>P; the storage of the 7 elements in soil layers of 0～40 cm is 24 359.75 kg·hm^(-2): the storages of N, P, K, Ca, Mg, Na, Cl are 555.91, 54.64, 586.72, 11 629.04, (9 943.50), 655.03, and 934.91 kg·hm^(-2) respectively (N, P, K are available), which can be put in the order as Ca>Mg>Na>Cl>K>N>P; the annual amount of litterfall reaches 3 586.70 kg/hm^2 and its mass-loss ratio in the first year after falling is 57.48%; the accumulations of N, P, K, Ca, Mg, Na, Cl in the litterfall are 38.70, 4.95, 22.49, 38.05, 29.63, 10.51, and 39.78 kg·hm^(-2) respectively; their net releasing ratio and releasing amount are 56.67%, 73.91%, 92.68%, 62.52%, 98.79%, 88.44%, 98.20% respectively and 21.91, 3.65, 20.82, 23.79, 29.26, 9.32, 39.08 kg·hm^(-2) respectively; and the decomposition of Taxodium litterfall takes a faster step 180 days after it is fallen.

关 键 词：林学 珠江三角洲 池杉林网 营养元素 贮量 归还量 释放量 

分 类 号：S718.5[农业科学—林学]