间种绿肥模式下茶树光合特征参数的日变化

Diurnal Variation in Photosynthetic Characteristic Parameters of Tea Plant under Intercropping Green Manure Pattern

研究了茶园单种(对照)和间种绿肥模式(T_1、T_2)下茶树叶片光合特征参数的日变化。结果表明:与对照相比,间种绿肥模式显著提高了茶树叶片的叶绿素a含量、净光合速率、蒸腾速率、日光合总量和日蒸腾总量,降低了光合有效辐射、叶片温度和比叶重;在T_1和T_2下茶树叶片的净光合速率和蒸腾速率日变化均呈单峰曲线,峰值均出现在12:00时,而对照的均呈双峰曲线,其峰值分别出现在10:00时和16:00时;在间种绿肥模式T_1(绿肥株高135~145 cm)下茶树的光合参数表现最好。

The diurnal variations in photosynthetic characteristic parameters of tea plant leaves under the patterns of single cropping（the control） and intercropping green manure（T1 and T2） were studied in tea plantation.The results were obtained as follows：in comparison with the control,the patterns of intercropping green manure significantly increased the chlorophyll a content,net photosynthetic rate,transpiration rate,daily photosynthetic quantity and daily transpiration quantity of tea plant leaves,and reduced the photosynthetically active radiation,leaf temperature and specific leaf weight.The diurnal variations in net photosynthetic rate and transpiration rate of tea leaves under T1 and T2 all showed a single-peak curve,and the peak value all appeared at 12：00; while those under the control all exhibited a double-peak curve,and the peak value appeared at 10：00 and 16：00,respectively.Under intercropping green manure pattern T1（the plant height of intercropped green manure was 135 - 145 cm）,the photosynthetic characteristic parameters of tea plant leaves had the best performance.