| Camellia oleifera is an important woody edible oil tree species in southern China,and the seasonal drought in the south has always been an important meteorological factor affecting the yield and quality of C.oleifera.In order to provides theoretical and technical guidance for the water management and regulation of C.oleifera.this paper studied the relationship between the meteorological conditions of C.oleifera and the yield and quality of C.oleifera,the effects on the morphology and photosynthesis of C.oleifera under drought stress,and the regulation of growth regulators by spraying growth regulators on C.oleifera.The main results are as follows:(1)From 2017 to 2021,ranking of average fresh fruit yield of all sample plots in each year:2020(4 337.8 kg/hm~2)>2019(3 655.2 kg/hm~2)>2018(3 472.6 kg/hm~2)hm~2)>2017(3 086.6 kg/hm~2)>2021(2864.6 kg/hm~2).According to the analysis of forest land types,the average fresh fruit yield was ranked:the transformation of low-yield forest of C.oleifera(5148.3 kg/hm~2)>reclamation plot(4 286.5 kg/hm~2)>the old camellia oleifera forest plot(2406.1 kg/hm~2)>Strip renewal plot(1 186.7 kg/hm~2).From 2017 to 2021,the highest yield of seed was the transformation of low-yield forest in 2020(2 632.5 kg/hm~2),the lowest yield was 2017 strip renewal plot(300.0 kg/hm~2),ranking of average seed yield of all sample plots in each year:2020(1 253.1 kg/hm~2)>2019(1 082.3 kg/hm~2)>2018(1 026.0 kg/hm~2)>2021(939.4 kg/hm~2)>2017(936.2 kg/hm~2).According to the analysis of forest land types,the average tea seed yield was ranked:the transformation of low-yield forest(3645.1 kg/hm~2)>reclamation plot(3056.4 kg/hm~2)>the old camellia oleifera forest plot(1700.2 kg/hm~2)>Strip renewal plot(838.3 kg/hm~2).In Liuyang,the high temperature above 30℃occurs all the year round in summer and autumn,and the diurnal range is small,and the duration is often more than 2 months.at the same time,there is less rainfall and the cumulative effect of drought,which is not conducive to plant growth in the fruit expansion stage.C.oleifera has a certain ability to resist high temperature and drought.Under the same arid climate,the transformation of low-yield forest of perennial C.oleifera forest is beneficial to increase yield.(2)Spray regulators have a good synergistic effect on the growth characteristics and photosynthetic characteristics of C.oleifera,which can improve the growth rate of 41.74%in the spring compared with CK,and can also increase the photosynthetic capacity of leaves,and the comprehensive ranking of 5 growth regulators in drought resistance:4%Triacontanol.benzylaminopurine(diluted 2000 times)>1%indbutyrate·inducin.(diluted 250times,diluted 500 times)>0.1%Triacontanol Brassinolate internal fat(diluted 1000times)>1%Furfuryl amino group purine(diluted 500 times)>1%indolebutyric acid triacontanol(diluted 1000 times).(3)With the increase of drought degree,the number of dead leaves of C.oleifera increased,the number of dead leaves of C.oleifera in severe drought treatment was significantly more than that of mild drought treatment,and the leaf length,leaf width of C.oleifera leaves in severe drought treatment were significantly lower than those in mild drought treatment,and the impact of drought treatment on the leaf shape index was not significant.With the increasing drought degree,the leaf transpiration rate showed a downward trend.The photosynthesis of C.oleifera is very sensitive to soil moisture,mild drought stress will affect the photosynthetic rate of C.oleifera,when C.oleifera is subjected to severe drought stress,the net photosynthetic rate of leaves drops to a lower level,and growth is severely inhibited. |
PDF Full Text Request