摘要
为了探究生长年限对衰败期苜蓿和中老龄柠条的叶片光合生理特征及土壤水分的影响,在2014年于地处黄土高原水蚀风蚀交错带强烈侵蚀中心的神木六道沟小流域,测定了不同生长年限苜蓿(ALF_(10)、ALF_(13)、ALF_(33)和ALF_(49))和柠条(KOP_(10)、KOP_(25)、KOP_(43)和KOP_(73))的叶片光合参数、叶结构性状参数以及0～400 cm土层土壤体积含水量(SWC_(0-400))。结果表明:对于衰败期苜蓿,ALF_(10)和ALF_(13)叶片净光合速率(P_n)差异不显著(P>0.05),而后随生长年限的延长逐渐降低,ALF_(33)和ALF_(49)比ALF_(13)叶片的P_n(24.01μmol·m^(-2)·s^(-1))分别降低了2.32μmol·m^(-2)·s^(-1)和7.76μmol·m^(-2)·s^(-1)。相比ALF_(10),随生长年限延长SWC_(0-400)恢复至10.88%(ALF_(13)),而后随着生长年限延长降低至8.81%(ALF_(33))和6.12%(ALF_(49))。土壤水分对ALF_(33)的限制作用不明显,水分胁迫使ALF_(49)非气孔限制值比ALF_(33)增大了0.340。对于中老龄期柠条,叶片P_n随生长年限的延长先升高后降低,KOP_(25)和KOP_(43)叶片P_n最大且两者差异不显著(P>0.05),比KOP_(10)(6.62μmol·m^(-2)·s^(-1))分别增大了6.57μmol·m^(-2)·s^(-1)和7.66μmol·m^(-2)·s^(-1),KOP_(73)比KOP_(43)叶片P_n降低了4.95μmol·m^(-2)·s^(-1)。对于同为黄绵土生长的KOP_(10)、KOP_(43)和KOP_(73),SWC_(0-400)随生长年限延长逐渐上升,分别为8.50%、9.06%和10.71%。土壤水分恢复使KOP_(43)叶片气孔及非气孔限制值比KOP_(10)柠条降低了0.185和2.180。此外,柠条叶片相对叶绿素含量(SPAD)与P_n呈极显著正相关(P<0.001),相关系数为0.514。研究结果表明衰败期苜蓿和中老龄期柠条叶片光合性能呈波动式变化,这与土壤水分的相互作用有关。
In order to explore the effect of growing age of Medicago sativa and Caragana korshinkii on leaf photosynthetic characteristics and soil moisture,we studied the dynamics of leaf photosynthetic parameters,leaf traits and soil volume-tric water content at the 0~400 cm soil depth(SWC 0-400)of Medicago sativa in degraded period(ALF10,ALF13,ALF33,and ALF49)and Caragana korshinkii in middle-and old-aged period(KOP10,KOP25,KOP43,and KOP73).This study was conducted in 2014 at the Liudaogou catchment located in the severe erosion center of wind-water erosion crisscross region on the Loess Plateau of China.The results showed that leaf photosyntheticrate(Pn)was not significantly different between ALF 10 and ALF 13(P>0.05),and gradually decreased with growing age(ALF33 and ALF49).Compared with ALF13,Pn of ALF33 and ALF49 decreased 2.32μmol·m^-2·s^-1 and 7.76μmol·m^-2·s^-1,respectively.Compared with ALF10,SWC0-400 increased to 10.88% (ALF13)and then decreased to 8.81% (ALF33)and 6.12% (ALF49).The limitation of soil moisture on ALF33 was not significant,but water stress increased 0.340 of the non-stomatal limitation of photosynthesis for ALF49.As to C.korshinskii,Pn increased first and then decreased with increasing growing age.Pn of KOP25 and KOP43 was not significantly different(P>0.05),and they were 6.57 and 7.66μmol·m^-2·s^-1,respectively,greater than KO10.Compared with KOP43,Pn of KOP73 decreased 4.95μmol·m^-2·s^-1.SWC0-400 increased with growing age for KOP10(8.50% ),KOP43(9.06% ),and KOP73(10.71% ),which all grew in Loessial soil.The recovery of soil moisture decreased 0.185 the stomatal and 2.180 non-stomatal limitations for KOP43.Moreover,there was significant correlation between relative chlorophyll content and Pn for C.korshinskii(P<0.001,r=0.514).Collectively,results from our study indicated that leaf photosynthetic parameters fluctuated with increasing age for M.sativa in degraded period and C.korshinskii in middle-and old-aged period,which was related to changes in soil moisture.
作者
姚毓菲
邵明安
贾玉华
李同川
YAO Yu-fei;SHAO Ming-an;JIA Yu-hua;LI Tong-chuan(State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographical Sciences and Natural Research,Chinese Academy of Sciences,Beijing 100101,China;College of Water Resource,Shenyang Agricultural University,Shenyang,Liaoning 110866,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《干旱地区农业研究》
CSCD
北大核心
2019年第2期18-24,共7页
Agricultural Research in the Arid Areas
基金
国家自然科学基金资助项目(41390463
41530854和41571221)
关键词
生长年限
光合特征
土壤水分
衰败期苜蓿
中老龄柠条
黄土高原
growing age
photosynthetic characteristic
soil moisture
Medicago sativa in degraded period
Caragana korshinkii in middle-and old-aged period
the Loess Plateau
