摘要
在乌兰布和沙漠东北部地区,依据多年平均月降水量,对5个种源的白刺幼苗进行极度干旱、干旱、轻度干旱和正常降雨水平4种不同的水分梯度处理,开展水分梯度试验。通过测定不同水分梯度、不同种源的光合生理指标表明:水分梯度显著影响白刺幼苗的净光合速率、蒸腾速率、气孔限制值、气孔导度、光合水分利用效率、表观光能利用效率、表观CO2利用效率等生理生态特征,并影响植株的苗高和最大新枝长等生长量指标;不同种源之间的净光合速率、水分利用效率、表观光能利用效率、表观CO2利用效率存在显著差异,且在苗高和最大新枝长之间也存在显著差异,但不同种源、不同水分梯度对幼苗的地径均无显著影响。相比于临河、乌拉特后旗种源,磴口、阿拉善盟和民勤种源的蒸腾速率和资源利用效率在不同水分处理之间表现出显著差异,且3个种源的各个资源利用效率都较大。白刺幼苗在光合活动中的气体交换及资源利用效率的生理反应和外在的生长量表型指标的差异,反映了各白刺种源对不同水分环境表现出的响应差异。
In the northeastem Ulanbuh Desert, a water gradient experiment was conducted with seedlings of five provenances of Nitraria tangutorurn according to the average annual precipitation, including extreme drought, drought, slight drought and normal precipitation. The physiological indices and growth indices of the five provenances were measured in response to the four water status. The results showed that net photosynthetic rate, transpiration rate, stomatal conductance, and stomatal limitation value were significantly affected by the different water status. There was significant differences in only net photosynthetic rate among the five provenances. There were difference in the water use efficiency, apparent light use efficiency and apparent CO2 use efficiency, and seedling height and maximum new branch length existed among the water gradient or different provenances. Both of water gradient and different provenances had no remarkable influence upon the ground diameter of seedlings. In comparison with Linhe provenance （LH） and Urad houqi provenance （WH）, Dengkou provenance （DK）, Alxa League provenance （AM） and Minqin provenance （MQ） all showed the distinct differences in transpiration rate and resource use efficiency among the water gradients and had higher resource use efficiency. The differences in growth and gas exchange and resource use efficiency in responses to the water gradient among different provenances reflected the response difference of Nitraria tangutorurn provenances.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2008年第1期52-56,共5页
Scientia Silvae Sinicae
基金
国家林业局948课题(2006-4-02)
国家“十一五”科技支撑计划专题(2006BAD26B0801)
防沙治沙科技攻关课题(2005BA517A01)
关键词
乌兰布和沙漠
水分梯度
光合生理
植株生长
种源
白刺
Ulanbuh Desert
water gradient
photosynthetic physiology
plant growth
provenance
Nitraria tangutorum
