Water And Nitrogen Treatment On The Developing And Water Transport Mechanism Of Jatropha Curcas L.under Salt Stress.

Jatropha curcas L.biodiesel is a versatile species in our country now.In Hainan,Yunnan,Sichuan and other places,there have a large area of distribution and cultivation.It can be grown survive in soil salinization,soil sand and other areas,environmental stress tolerance ability.Jatropha curcas L.planting not only can effectively protect water solid soil,prevent desertification,but also regions effectively vegetation restoration in arid and semi-arid.After the trees mature,which bear the seed kernel oil content as high as 60%,petrochemical diesel quality replacement.In this study with Jatropha curcas L.,Different irrigation and nitrogen fertilization method of processing an important indicator of growth,morphology and water transport mechanism,which will salinization and efficient use of land,repair,improve,improve the utilization of land salinization provide a theoretical basis under different salt stress.Under conditions of this study,we obtained the following conclusions:(1)Under the potted plants experiment,with the increase of applied salt,Jatropha curcas L.Huber value increased significantly,while the total dry mass,leaf area,root to shoot ratio,seedling index,water use efficiency decreased significantly.According to the regression analysis shows that,in different water and nitrogen treatments under salt stress conditions,the impact of irrigation water use efficiency of seedling index value greater than Huber.Compared with the high levels of salt(6g/kg),salt levels(3g/kg)under different water and nitrogen on the growth of Jatropha curcas L.,morphological and irrigation water use efficiency have a certain role,but these treatments in water and nitrogen(25.4mm,0.4g/kg)treatment were better than other water and nitrogen treatments.(2)Under the district experiment,CK(comparison group),S1(soil salinity 0.2%)and S2(soil salinity 0.4%),the various organs of Jatropha curcas L.hydraulic conductivity(no quantized value)in decreasing order as Kmr>K(mr+p)>K(l+p)>Kr>Ksh,water resistance(no quantized value)Rt>Rsh>Rr>R(mr+p)>Rmr;whereas in S3(soil containing salt 0.6%),the hydraulic conductivity(no quantized value)was descending Kmr>K(mr+p)>K(l+p)>Ksh>Kr,water resistance(no quantized value)Rt>Rr>Rsh>R(mr+p)>Rmr.In all treatment groups,N2S1(60g/plant,soil salinity 0.2%)of Jatropha curcas L.various organs are the maximum hydraulic conductivity,water resistance is minimized.(3)Under the district experiment,Through the quantification of the total leaf area can be seen,when the soil salinity is S1,the increase is to reduce the amount of nitrogen fertilizer Jatropha curcas L.roots and canopy water guide main reason,when high soil salinity(S2,S3),reduced nitrogen fertilizer to increase Jatropha curcas L.roots and canopy water conductivity is much lower than the effect of lower salt content in soil(S1);through the base stem cross-sectional area can be seen after quantization,soil salinity is S1,S2,S3,the nitrogen fertilization can effectively promote both Jatropha curcas L.roots and increase the canopy water conductivity,thereby reducing the corresponding water resistance.After quantization with different quantization value curve fitting Huber found that water conductivity values of leaf area quantized values fit with Huber after its goodness of fit is greater than a cross-sectional area of the stem through group quantized water guide value;and in the same manner quantization after canopy water conductivity value Huber quantized values fit goodness of fit is greater than the value of root hydraulic conductivity and thus had Jatropha curcas L.in the water transfer process,and canopy roots can also impact the water transfer efficiency compared to Jatropha curcas L..