南京林业大学学报（自然科学版）2016，Vol.40Issue(2)：113-120,8.DOI:10.3969/j.issn.1000-2006.2016.02.019
吉林蛟河不同演替阶段针阔混交林凋落物持水特性研究
Hydrological characteristics of forest litters in conifer and broad-leaved mixed forests at different forest successional stages in Jiaohe, Jilin Province
摘要
Abstract
The forest litter layer is indispensible for the protection of forest soil, it plays an important role in forest soil and water conservation. The purpose of this paper is to analyze the variation laws of hydrological characteristics of forest litters in conifer and broad⁃leaved mixed forests at different successional stages in the northeast mountainous area of Chi⁃na. We investigated the forest litters in conifer and broad⁃leaved mixed forests at different successional stages in Jiaohe management bureau of forestry experimental area, Jilin Province. The litter samples were collected from middle⁃aged for⁃est, near⁃mature forest and mature forest. Within each forest plot, a total of five square subplots with dimension of 20 cm×20 cm were set up using serpentine sampling method. The litters in the un⁃decomposed layer and semi⁃decom⁃posed layer were taken back to lab for analyzing the hydrological characteristics of forest litters. The standard branch soa⁃king method was used to calculate the storage of forest litters, water holding capacity, water holding rate, as well as the modified interception amount. For each sample, the litters were divided into four groups evenly and part of the litters was selected to measure the weight by electronic analytical balance, and then put in the 100-mesh nylon mesh. The soaking time was set as 0.25, 0.5, 1, 2, 4, 8 and 24 h, respectively. Combined with the field observation data, the relationship between the hydrological characteristics of forest litters and successional stages was analyzed. The litter storage of mature forest was the largest ( 7. 26 t/hm2 ) , followed by near⁃mature forest ( 4. 56 t/hm2 ) , and middle age forest ( 3�68 t/hm2).The order of the maximum water holding capacity was as follows:mature forest (21.23 t/hm2)>near⁃mature for⁃est(35.24 t/hm2)>middle⁃aged forest(47.71 t/hm2)and the maximum water holding rate was 844.72% in mature forest, 742.58% in near⁃mature forest, and 592. 02% in middle⁃aged forest, respectively. The descending order of the modified interception amount was mature forest (31.32 t/hm2), near⁃mature forest (20.52 t/hm2), and middle⁃aged forest (11�98 t/hm2). The soaking experiment demonstrated that both water holding capacity and water holding rate had remarkable logarithmic correlation with soaking time, while the absorption rate and soaking time was of a power function. The water holding capacity of mature forest was the largest, followed by near⁃mature forest and middle age forest. This is due to the fact that along with the forest succession the forest crown tends to close, the understory species becomes rich and nutrients increase, therefore the water holding capacity of forest litter layers increase gradually. The orders of maxi⁃mum water holding capacity, maximum water holding rate and litter storage volume were consistent among different forest successional stages, which indicated that the there were strong correlation between water holding capacity and water holding rate with litter storage volume. The higher the litter storage volume, the higher the water holding capacity and water holding rate.关键词
森林演替/凋落物/水文特性/针阔混交林/吉林蛟河Key words
succession of forest/litter/hydrological characteristics/broad-leaved mixed forest/Jiaohe, Jilin Province分类
农业科技引用本文复制引用
吴金卓,孔琳琳,王娇娇,林文树..吉林蛟河不同演替阶段针阔混交林凋落物持水特性研究[J].南京林业大学学报（自然科学版）,2016,40(2):113-120,8.基金项目
中央高校基本科研业务费专项资金项目（2572015CA01）；国家自然科学基金项目（31400539）；“十二五”国家科技支撑计划 （）
