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以伐桩储水毛竹(Phyllostachys edulis)林为研究对象,设置CK(0个伐桩储水)、T1(12个伐桩储水)和T2(18个伐桩储水)3个灌水量处理(样地大小:10 m×20 m),测定2年生毛竹叶片光合色素含量、光合蒸腾生理指标及主要环境因子,研究不同数量储水伐桩下毛竹叶片光合色素含量、光合蒸腾特性差异及其与环境因子间的关系。试验表明:(1)不同处理间各光合色素含量均表现为T2>T1>CK,Chla、Chlb、Car和Chla+Chlb含量的最大增幅分别为17.05%、14.49%、25.93%和17.19%。(2)不同处理下毛竹净光合速率与蒸腾速率日变化均为单峰曲线,均未出现“光合午休”现象,各处理间毛竹净光速率与蒸腾速率日变化均表现为T2>T1>CK。(3)增加储水伐桩后,12:00—14:00间引起毛竹净光合速率降低的因素由非气孔限制变为气孔限制。(4)增加储水伐桩后,毛竹净光合速率与各环境因子关联度大小的顺序发生了变化;不同处理下毛竹蒸腾速率与各环境因子关联度大小的顺序均不完全相同。研究表明,增加储水伐桩数量在一定范围内可使毛竹各光合色素含量增加,光合与蒸腾能力提高,光合产物积累增加,改善了毛竹的生长状况,且各光合色素含量、光合蒸腾能力与储水伐桩数量正相关。本研究为毛竹林节水灌溉措施的制定和培育生产提供了理论依据。
Taking Phyllostachys edulis forest as the research object, three irrigation treatments, CK (0 stump storage), T1 (12 stump storage) and T2 (18 stump storage) (Sample size: 10 m × 20 m). The photosynthetic pigment content, photosynthetic and transpiration physiological indexes and the main environmental factors of two-year-old Phyllostachys pubescens leaves were determined. The photosynthetic pigment content, photosynthetic and transpiration characteristics of Phyllostachys pubescens leaves under different storage stumps were studied. Relationship with environmental factors. The results showed that: (1) The photosynthetic pigment contents of different treatments showed T2> T1> CK, and the maximum increase of Chla, Chlb, Car and Chla + Chlb contents were 17.05%, 14.49%, 25.93% and 17.19% respectively. (2) The diurnal changes of net photosynthetic rate and transpiration rate of Phyllostachys pubescens Phyllostachys heterocycla cv. Pubescens under different treatments were unimodal curves, and no “photosynthesis midday break” occurred. The diurnal changes of net photosynthetic rate and transpiration rate of Phyllostachys pubescens were all T2> T1 > CK. (3) The factors that caused the decrease of net photosynthetic rate of Phyllostachys pubescens from 12: 00-14: 00 were changed from non-stomatal limitation to stomatal limitation. (4) The order of the correlation degree of net photosynthetic rate of Phyllostachys pubescens and each environmental factor changed when the water logging pile was increased. The order of the correlation degree between the transpiration rate of Phyllostachys pubescens and the environmental factors was not the same under different treatments. The results showed that increasing the number of stored stumps could increase the content of photosynthetic pigments, the photosynthesis and transpiration of bamboo, the accumulation of photosynthetic products and the growth of bamboo, and the photosynthetic pigment content, photosynthesis and transpiration of Water storage pile number is positively correlated. This study provides a theoretical basis for the formulation and cultivation of bamboo water-saving irrigation measures.