| Fagopyrum dibotrys (D. Don) Hara, a Polygonaceae Fagopyrum perennial herb, is native to southeast of china and distributes to a large area of China such as Sichuan, Chongqing, Hunan, Guangxi, Shanxi, Jiangxi. Fagopyrum esculentum Moench, called sanjiaoma,wuma,huaqiao in Chinese and an annual Polygonaceae herb, is crop with triangle seeds. This species is native to Asia, is the main food of Ukraine, Belorussia and Poland and cultured in Liangshan state of Sichuan province, China. At present, the researches of these two above mentioned species are mainly concentrated on their pharmaceutic compenents, while the researches of their cultivation have rarely been reported. In this paper, the influence of UV-B radiation and acid rain treatment on the growth, the distribution of biomass, the light of leaf, the contents of pigment, protective enzyme and protective materials of F.dibotrys and F.emarginatum were studied and the plasticity of the two species under the enhanced UV-B radiation and acid rain treatment were compared. The researches can benifit for the wild-resource protection, cultivation and rational exploitation of the two species.1. The enhanced UV-B and acid rain treatment have influences on the height and distribution of biomass and the influences from gentle to severe are:UV-B radiation treatment> low-grade acid treatment UV-B radiation and low-grade acid rain treatments> severe acid rain treatment>UV-B radiation and severe acid rain treatment. UV-B radiation and low-grade aicd rain treatment alone have little effect on the height of the two species, but severe aicd rain treatment alone or combined with UV-B radiation treatment have significant effects on it; UV-B radiation and acid rain treatment alone have little effect on biomass of caudex and leaf but significantly reduce the biomass of root of F.dibotrys, and the severe aicd rain treatment alone or combined with UV-B radiation treatment have significant effects on the biomass of the two species. During whole the treatment, F.dibotrys failed to flowering, While F.emarginatum begain to flower in the middle stage of the treatment. F.emarginatum under CK begain to flower at the end of treatment and the biomass of floweres under treatment is higher than that of CK. The results suggest that F.emarginatum and F.dibotrys have some resistance to UV-B. radiation and low-grade acid rain, and the menace treatment induced the flowering of F.emarginatum. Compared the growth and the plasticity of biomass of the two species, we can see that the plasticity of growth and biomass distribution of the two species under UV-B radiation treatment is higer than that under acid rain treatment.2. The enhanced UV-B radiation and acid rain menace treatment show certain influences on the contents of photosynthetic pigments of the two species. At the end of the treatment, the content of chlorophyl a, chlorophyl b and total chlorophyl from high to low are:CK> UV-B radiation treatment> low-grade acid rain treatment> UV-B radiation and low-grade acid rain treatments> severe acid treatment>UV-B radiation and severe acid rain treatment. The results showed that UV-B radiation and low-grade acid rain treatment alone have little effects on the concentration of chlorophyl a and b at the beginning of treatment; at the middle of the treatments, all of the menace treatments reduced the concentration of chlorophyl a and b, and effect of severe acid rain treatment or when combined with UV-B radiation treatment are more significant, moreover, the reducing effect of chlorophyl a is higher than that of chlorophyl b; at the end of the treatments, UV-B radiation combing with severe acid rain treatment reduced the content of carotenoid. Generally speaking, UV-B radiation and acid rain have significant influences on the contents of light and pigments of F.dibotrys and F.emarginatum and the influences increased with time. Compared the growth and the plasticity of light and pigment of the two species, we can see that the plasticity of light and pigment contents of the two species under UV-B radiation treatment is higher than that under acid rain treatment, the two species have some resistance to low-grade acid rain but is sensitive to severe acid rain and UV-B radiation combing with acid rain treatment damaged the two species..3. From the results, we can see that the SOD activity enhanced under enhanced UV-B radiation and acid rain menace treatment and the SOD activity increased when the extent of menace enhanced;, the activity POD enhanced at the middle of the treatment but decreased at the end; the concentration of solubility proteins and sugar decreased at the end of the treatment and the decreasing extent increased with menace extent; the content of total flavonoids and proline increased firstly and then decreased; the content of MDA enhanced. All the results suggest that enhanced UV-B radiation and acid rain have little effect on the protective enzyme and materails at the beginning of the treatment, become severe from the middle of the treatment, and the resistance of the two species come to the ultimate point. Compared the plasticity of protection materials and enzymes of the two species, we can see that the plasticity of F.dibotrys on the content of protection materials and enzymes is higher than that of F.emarginatum.
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