摘要
以宁夏荒漠草原柠条锦鸡儿(Caragana kornshinskii)枯落物为研究对象,利用网孔分解袋法研究了极小型、小型、中型和大型柠条锦鸡儿灌丛微生境枯落物分解率变化特征及对土壤环境的响应规律。结果表明:(1)随着分解时间延长,不同大小柠条锦鸡儿灌丛微生境土壤含水量和土壤温度均呈现出相似的分布特征,而土壤pH值和电导率随时间分布特征则受到灌丛大小的显著影响。(2)3种网孔内,不同大小柠条灌丛微生境间枯落物分解率均无显著差异性。但是,灌丛微生境中枯落物分解率受到灌丛大小和网孔大小的共同影响。(3)中型灌丛微生境中枯落物分解率在3种网孔间均无显著差异性。但在极小型灌丛微生境中,120 d时枯落物分解率表现为4 mm(40.95%)>0.01 mm(38.51%)>2 mm(32.14%),150 d时枯落物分解率表现为2 mm(37.64%)>4 mm(35.20%)>0.01 mm(26.68%)。在小型灌丛微生境中,120 d时枯落物分解率表现为0.01 mm(46.81%)>4 mm(41.07%)>2 mm(34.75%)。在大型灌丛微生境中,120 d时枯落物分解率表现为4 mm(39.65%)>2 mm(36.65%)>0.01 mm(35.96%),210 d时枯落物分解率表现为2 mm(48.05%)>4 mm(35.96%)>0.01 mm(30.80%)。(4)Olson衰减指数模型得出枯落物分解50%和95%所需时间,表现为极小型灌丛和中型灌丛微生境中均为0.95年和4.1年(3种网孔相同);小型灌丛微生境中为0.63年和2.74年(4 mm)、1.90年和8.21年(2 mm)、0.95年和4.1年(0.01 mm);大型灌丛微生境中为0.95年和4.1年(4 mm)、0.63年和2.74年(2 mm)、1.90年和8.21年(0.01 mm)。研究表明,在宁夏荒漠草原,仅灌丛大小引起的微生境差异对枯落物分解率影响较小,但灌丛大小和土壤动物类群的相互作用对枯落物分解率的影响较大。
In Yanchi County, Ningxia, the decomposition rates of C. korshinskii litter and the associated soil environment were sampled in microhabitats beneath very small, small, medium, and large shrub canopy sizes. Our study found that(1) during the decomposition process, soil moisture content and soil temperature indicated similar distributions in the four types of shrub canopy size, however, soil pH and soil electrical conductivity changed significantly among the four types.(2) no significant differences within the three mesh sizes between the four types of shrub canopy size in the decomposition rate of shrub litter in the litter bag was found.(3) no significant differences in the litter decomposition rate of shrubs in the litter bag within the three mesh sizes in the medium shrub microhabitat was found. In the very small shrub microhabitat, the decomposition rate of shrub litter within the three mesh sizes were 4 mm(40.95%)>0.01 mm(38.51%)>2 mm(32.14%) at 120 d. However, it followed the order of the three mesh sizes of 2 mm(37.64%)>4 mm(35.20%)>0.01 mm(26.68%) at 150 d. In the small shrub microhabitat, the decomposition rate of shrub litter within the three mesh sizes followed the order of 0.01 mm(46.81%)>4 mm(41.07%)>2 mm(34.75%) at 120 d, whereas it was found to follow the order of the three mesh sizes, being 2 mm(37.64%)>4 mm(35.20%)>0.01 mm(26.68%) at 150 d. In the large shrub microhabitat, the decomposition rate of shrub litter within three mesh sizes was 4 mm(39.65%)>2 mm(36.65%)>0.01 mm(35.96%) at 120 d. However, it was found to follow the order of the three mesh sizes, being 2 mm(48.05%)>4 mm(35.96%)>0.01 mm(30.80%) at 150 d.(4) according to the Olson index, it took 0.95 and 4.1 years for C. korshinskii litter within the three-size meshes to decompose at 50% and 95% respectively in the microhabitats of very small and medium shrub sizes. The litter in the small shrub microhabitats spent 0.63 a and 2.74 a(4 mm), 1.90 a and 8.21 a(2 mm), and 0.95 a and 4.1 a(0.01 mm), of the large shrub size spent 0.95 a and 4.1
作者
刘佳楠
常海涛
赵娟
张安宁
陈蔚
张静
罗雅曦
刘任涛
LIU Jianan;CHANG Haitao;ZHAO Juan;ZHANG Anning;CHEN Wei;ZHANG Jing;LUO Yaxi;LIU Rentao(Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China of Ministry of Education,Ningxia University,Yinchuan750021,China;College of Agriculture,Ningxia University,Yinchuan 750021,China)
出处
《生态学报》
CAS
CSCD
北大核心
2019年第11期4039-4048,共10页
Acta Ecologica Sinica
基金
国家自然科学基金项目(41661054,41867005)
宁夏青年拔尖人才支持计划
宁夏高校“生态学”西部一流学科项目(NXYLXK2017B06)
宁夏大学研究生创新项目(GIP2018075)
关键词
荒漠草原
柠条锦鸡儿
灌丛大小
枯落物
分解率
网孔分解袋
desertified grassland ecosystem
Caragana korshinskii
shrub size
litter
decomposition rate
litter bag of different mesh
