摘要
用LI-6400便携式光合作用测定系统对希拉穆仁草原短花针茅和糙隐子草的各项光合指标进行了测定,结果显示:随着草地退化程度加重,短花针茅和糙隐子草的净光合速率、蒸腾速率、胞间CO_2浓度及气孔导度均表现为轻度退化>中度退化>重度退化,短花针茅和糙隐子草的光合速率、蒸腾速率随草地退化的加剧而降低,短花针茅的各项光合指标降低幅度比糙隐子草相应指标降幅大。短花针茅的水分利用效率低于糙隐子草而光合速率高于糙隐子草,表明其对环境特别是干旱的耐受能力低于糙隐子草。土壤全氮、全磷和含水量是影响不同退化程度草原短花针茅光合特性的主要因素,而不同退化程度草原糙隐子草光合特性主要受土壤含水量影响。
In order to study the photosynthetic characteristics of plants under different degradation degrees of grassland, the photosynthetic indexes of Stipa breviflora and Cleistogenes squarrosa were measured with LI-6400 portable photosynthesis system.The results showed that:(1) With the deteriorating degree of grassland degradation, the net photosynthetic rate (Pn), transpiration rate (Tr), intercellular CO 2 concentration (Ci) and stomatal conductance (Gs) of Stipa breviflora and Cleistogenes squarrosa were all as follows: light deteriorate (LD)>moderate deteriorate (MD)>heavy deteriorate (HD), The photosythesis and transpiration of Stipa breviflora and Cleistogenes squarrosa decreased with increasing grassland degradation.(2) The photosynthetic indices of Stipa breviflora decreased more than those of Cleistogenes squarrosa, and the water use efficiency of Stipa breviflora was lower than that of Cleistogenes squarrosa, indicating that the photosynthetic capacity of Stipa breviflora was stronger than that of Cleistogenes squarrosa, but the environmental tolerance of Stipa breviflora was lower than that of Cleistogenes squarrosa.(3) Total nitrogen (TN), total phosphorus (TP) and soil water content (Sw) were the main factors affecting the photosynthetic characteristics of Stipa breviflora under different degraded grasslands, while the photosynthetic characteristics of Cleistogenes squarrosa in different degraded grasslands were mainly affected by Sw.
作者
韩秀峰
李红丽
刘铁军
韩国栋
董智
HAN Xiu-feng;LI Hong-li;LIU Tie-jun;HAN Guo-dong;DONG Zhi(Forestry College of Shandong Agricultural University, Shandong Provincial Key Laboratory of Soil Erosoin and Ecological Restoration, Taishan Forest Ecosystem Research Station, Tai'an 271018,China;Institute of Water Resources Science, Ministry of Water Resources, Hohhot 010020, China;Collgeg of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010010, China)
出处
《中国草地学报》
CSCD
北大核心
2019年第2期9-15,共7页
Chinese Journal of Grassland
基金
"十三五"国家重点研发计划"中温性荒漠草原区退化草地修复与家庭牧草精准管理技术研发与示范"(2016YFC0500504)
国家自然科学基金面上项目(51579157
51779156
51879155
31870708)
中国水科院基本科研业务费专项项目(MK2016J12
MK2018J01)
关键词
希拉穆仁草原
草地退化
光合特征
短花针茅
糙隐子草
Grassland degradation
Xilamure grassland
Photosynthetic characteristics
Stipa breviflora
Cleistogenes squarrosa
