摘要
以宁夏荒漠草原柠条(Caragana kornshinskii)枯落物为研究对象,采用网袋分解法(4、2和0.01mm),研究了不同大小柠条灌丛(极小型Ⅰ、小型Ⅱ、中型Ⅲ、大型Ⅳ)下微生境枯落物分解过程中养分质量残留率变化特征。结果表明,1)分解至210d时,N、K元素在3种网孔内均呈现释放状态,而P元素和纤维素在3种网孔内均呈现富集状态。木质素仅在0.01mm网孔内的大型灌丛微生境中呈富集状态,而在极小型、小型和中型灌丛微生境中呈释放状态。2)在Ⅱ类、Ⅲ类和Ⅳ类灌丛微生境中,枯落物养分元素残留率表现为3种网孔间均无显著差异(P>0.05)。但是在Ⅰ类灌丛微生境中,N、P和K元素残留率均表现为0.01mm(-32.99%、121.03%、-2.04%)>4mm(-63.64%、14.31%、-6.95%)>2mm(-75.47%、9.79%、-36.32%),木质素残留率表现为0.01mm(-10.56%)>2mm(-46.18%)>4mm(-49.59%),而纤维素残留率表现为2mm(160.44%)>4mm(97.80%)>0.01mm(21.56%)。研究表明,在宁夏荒漠草原地区,3种网孔分解袋内不同大小柠条灌丛微生境中枯落物N、K、P元素和纤维素变化规律均相似,而木质素受到土壤动物类群分布和柠条灌丛大小的双重影响。
An investigation of the elemental nutrient residual rate of Cartagena korshinskii shrub litter was conducted using the litter bag method (4,2,0.01 mm) in Yanchi County,Ningxia.The results showed: 1) At 210 days,there was a "release" of litter N and K,whereas there was an "accumulation" of litter P and cellulose in C.korshinskii shrub litter within litter bags with three size meshes.Regarding lignin,there was an "accumulation" in the large shrub microhabitats,whereas there was a "release" in the microhabitats with very small-,small-,and medium-sized shrubs in the 0.01 mm mesh litter bags only.2)There were no significant (P > 0.05) differences in residual rate in the litter between three types of meshes in the microhabitats of small,medium,and large-sized shrubs.In the microhabitats of very small-sized shrubs,however,the residual rate of litter N,P,and K was in the order of 0.01 mm (-32.99%,121.03%,-2.04%)> 4 mm (-63.64%,14.31%,-6.95%)> 2 mm (-75.47%,9.79%,-36.32%),that of lignin was 0.01 mm (-10.56%)> 2 mm (-46.18%)> 4 mm (-49.59%),and that of cellulose was 2 mm (160.44%)> 4 mm (97.80%)> 0.01 mm (21.56%).It was concluded that there were similar changes in litter nutrient elements N,K,P,and cellulose in microhabitats of very small,small,medium,and large shrubs in all three mesh sizes.However,there were interactive effects of soil faunal groups and shrub canopy sizes on litter lignin following the decomposition process in desertified grassland ecosystems of Ningxia.
作者
刘佳楠
赵娟
常海涛
张安宁
陈蔚
刘任涛
LIU Jianan;ZHAO Juan;CHANG Haitao;ZHANG Anning;CHEN Wei;LIU Rentao(Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China of Ministry of Education,Ningxia University,Yinchuan 750021,Ningxia,China)
出处
《草业科学》
CAS
CSCD
2019年第6期1624-1633,共10页
Pratacultural Science
基金
国家自然科学基金(41867005、41661054)
宁夏高等学校科学研究(NGY2018007)
宁夏自然科学基金(2018AAC02004)
自治区科技基础条件建设计划创新平台专项资金项目(2018DPC05021)
宁夏青年拔尖人才计划(RQ0010)
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
枯落物分解
元素变化
灌丛大小
网孔分解袋
desertified steppe
Caragana korshinskii
litter decomposition
element change
shrub size
litter bag of differentmesh