| Effects of growing age on photosynthetic characteristics and soil moisture for Medicago sativa and Caragana korshinkii |
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| DOI：10.7606/j.issn.1000-7601.2019.02.03 |
| Key Words: growing age photosynthetic characteristic soil moisture Medicago sativa in degraded period Caragana korshinkii in middle- and old\|aged period the Loess Plateau |
| Author Name | Affiliation | | YAO Yu-fei | 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
University of Chinese Academy of Sciences, Beijing 100049, China | | SHAO Ming-an | 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 | | JIA Yu-hua | College of Water Resource, Shenyang Agricultural University, Shenyang, Liaoning 110866, China | | LI Tong-chuan | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Research,Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: |
| 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 (SWC0-400) 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 ALF10 and ALF13 (P>0.05), and gradually decreased with growing age (ALF33 and ALF49). Compared with ALF13, Pn of ALF33 and ALF49 decreased 2.32 μmol·m-2·s-1 and 7.76 μmol·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 7.66 μmol·m-2·s-1, respectively, greater than KOP10. Compared with KOP43, Pn of KOP73 decreased 4.95 μmol·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. |
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