| 基于夏秋两季黑麦草光合特性的喷播基质含水量阈值分级 |
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| 引用本文： | 刘小勇,史常青,赵廷宁,邢富强,王璞,郝佩雯,张晶晶,王晶,孙慧杰.基于夏秋两季黑麦草光合特性的喷播基质含水量阈值分级[J].浙江农林大学学报,2023,40(1):198-208. |
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| 作者姓名： | 刘小勇 史常青 赵廷宁 邢富强 王璞 郝佩雯 张晶晶 王晶 孙慧杰 |
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| 作者单位： | 1.北京林业大学 水土保持学院，北京 1000832.北京林业大学 林业生态工程教育部工程研究中心，北京 1000833.河北省涿鹿县林业和草原局，河北 涿鹿 075600 |
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| 基金项目： | 国家重点研发计划项目(2019YFF0303202-03) |
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| 摘 要： | 目的 针对客土喷播基质过度灌溉造成坡面水土流失、影响植物生长等问题，提出植被生长的喷播基质适宜含水量阈值。 方法 采用种植盆模拟裸露创面客土喷播试验，设计5种喷播基质水分梯度；使用Li-6400XT便携式光合仪测定夏、秋季黑麦草Lolium perenne的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和胞间二氧化碳(CO2)摩尔浓度(Ci)等光合参数，分析夏、秋季黑麦草光合参数与喷播基质含水量的关系。 结果 ①夏、秋季黑麦草净光合速率水合补偿点的喷播基质相对含水量(CRW)分别为35.02%和30.83%(即实际质量含水量分别为10.63%和9.36%)。②夏、秋季黑麦草Pn下降，由气孔限制转变为非气孔限制的喷播基质CRW均为55.00%(即实际质量含水量为16.70%)。③黑麦草喷播基质含水量阈值可分为5种类型，即“无产无效水”“低产低效水”“中产中效水”“中产高效水”“高产高效水”。 结论 ①客土喷播绿化以快速恢复植被为目标时，可保持喷播基质含水量在“高产高效水”范围，以此为标准进行灌溉，夏季为76.25%≤CRW≤78.17%，其实际质量含水量为23.15%~23.73%；秋季为73.61%≤CRW≤76.02%，其实际质量含水量为22.35%~23.08%。②客土喷播绿化以提高水分利用效率并恢复基本植被(即恢复到当地自然植被盖度)为目标时，可保持喷播基质含水量在“中产高效水”范围，以此为标准进行灌溉，夏季为55.00%≤CRW≤76.25%，其实际质量含水量为16.70%~23.15%；秋季为55.00%≤CRW≤73.61%，其实际质量含水量为16.70%~22.35%。图10表4参25
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| 关 键 词： | 喷播基质适宜含水量 净光合速率 水分利用效率 阈值分级 黑麦草 |
| 收稿时间： | 2022-01-13 |
Threshold gradient of water content of spraying substrate based on photosynthetic characteristics of Lolium perenne in summer and autumn |
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| LIU Xiaoyong,SHI Changqing,ZHAO Tingning,XING Fuqiang,WANG Pu,HAO Peiwen,ZHANG Jingjing,WANG Jing,SUN Huijie.Threshold gradient of water content of spraying substrate based on photosynthetic characteristics of Lolium perenne in summer and autumn[J].Journal of Zhejiang A&F University,2023,40(1):198-208. |
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| Authors: | LIU Xiaoyong SHI Changqing ZHAO Tingning XING Fuqiang WANG Pu HAO Peiwen ZHANG Jingjing WANG Jing SUN Huijie |
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| Institution: | 1.College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China2.Forestry Ecological Engineering Research Center, Ministry of Education, Beijing Forestry University, Beijing 100083, China3.Zhuolu Forestry and Grassland Administration, Zhuolu 075600, Hebei, China |
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| Abstract: | Objective This study, with an analysis of how the over-irrigation of soil spraying substrate has caused soil erosion and affected plant growth, is aimed to put forward an optimal threshold of suitable water content of spraying substrate for vegetation growth. Method First, planting pots were used to simulate the experiment of soil spraying on bare slopes, and 5 kinds of water gradients of spraying substrates were designed. Then, efforts were made to measure the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) of Lolium perenne by Li-6400XT portable photosynthetic analyzer in summer and autumn before an analysis was conducted of the relationship between photosynthetic parameter of L. perenne and water content of spraying substrates. Result (1) The relative water content (CRW) of the spraying substrate at the net photosynthetic rate hydration compensation point of L. perenne in summer and autumn were 35.02% and 30.83% respectively (with the actual substrate mass water content being 10.63% and 9.36% respectively). (2) In summer and autumn, CRW of sprayed substrate, where the Pn of L. perenne decreased from stomatal limitation to non-stomatal limitation, was 55.00% (with the actual substrate mass water content being 16.70%). (3) The spraying substrate water content threshold of L. perenne comes in five types, namely non-productivity and non-efficiency water, low productivity and low efficiency water, middle productivity and middle efficiency water, middle productivity and high efficiency water and high productivity and high efficiency water. Conclusion When the goal of soil spraying and greening is to quickly restore vegetation, the water content of the spraying substrate can be kept in the range of high productivity and high efficiency water, based on which irrigation is carried out: in summer, it is 76.25%≤CRW≤78.17%, with its actual mass water content being 23.15%?23.73% whereas in autumn, it is 73.61%≤CRW≤76.02%, with its actual mass water content being 22.35%?23.08%. On the other hand, when the goal of soil spraying greening is to improve the water use efficiency and restore the basic vegetation (that is, to restore the local natural vegetation coverage), the water content of the spraying substrate can be kept in the range of “middle productivity and high efficiency water ”, based on which irrigation is carried out: in summer, it is 55.00%≤CRW≤76.25%, with its actual mass water content being 16.70%?23.15% whereas in autumn, it is 55.00%≤CRW≤73.61%, with its actual mass water content being 16.70%?22.35%. Ch, 10 fig. 4 tab. 25 ref.] |
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