Sabina vulgaris is a unique evergreen conifer shrub and expands its area by the growth of stolon along the ground surface on which adventitious roots are formed and absorb water and nutrient. Therer is notable differe...Sabina vulgaris is a unique evergreen conifer shrub and expands its area by the growth of stolon along the ground surface on which adventitious roots are formed and absorb water and nutrient. Therer is notable difference between the thickness of sand layer and sprouting of adventitious roots, especially between the great thickness sand layer and the other three types. Minor thickness of sand layer is enough to better off the soil water content in the soil layer (0～10?cm),while the soil moisture content decreased on the condition of great number sprouted adventitious roots, as a result, it is difficult for the adventitious roots to sprout. When the soil moisture content is below 1.0%, it is a question for adventitious roots to sprout. The adventitious roots was able to sprout on the 2 year old stolon on the condition in which the sand is easily accumulated, even on the 9 year old stolon on the medium and great thickness of sand layer. This indicates that the age is not the key factor for restricting the adventitious roots to sprout.展开更多
In order to reveal the physiological reaction and adaptability of natural Sabina vulgaris community to sandy environment in different successional stages, we determined physiological index of drought_resistance of S.v...In order to reveal the physiological reaction and adaptability of natural Sabina vulgaris community to sandy environment in different successional stages, we determined physiological index of drought_resistance of S.vulgaris under different successional stages by colorimetry in TuKe of Mu Us Sandland. The results showed that with the process of the succession, PRO and MDA contents increase first, and then decrease during the process of the succession. The variance analysis showed that the difference of the PRO contents among stages is more significant. The difference of the SOD and POD activity is more significant among stages, but the CAT activity has no significant change. In the fourth successional stage, the contents of MDA and PRO increase, the activity of SOD and POD increase. All of them show the physiological characters of damaged plant under the environment hardness. The correlation analysis between PRO、MDA and protective enzymes activity showed: the positive correlation of the change of SOD、POD activity with the change of MDA contents is significant. The decrease of MDA will increase protective enzymes activity which in the leaf. The response of the physiological index to the environment hardness in different successional stage is not similar. First, some damaged characters appeared in the fourth stage; second, some index are stable in the third stage. It indicated that the third stage is a stable period.展开更多
文摘Sabina vulgaris is a unique evergreen conifer shrub and expands its area by the growth of stolon along the ground surface on which adventitious roots are formed and absorb water and nutrient. Therer is notable difference between the thickness of sand layer and sprouting of adventitious roots, especially between the great thickness sand layer and the other three types. Minor thickness of sand layer is enough to better off the soil water content in the soil layer (0～10?cm),while the soil moisture content decreased on the condition of great number sprouted adventitious roots, as a result, it is difficult for the adventitious roots to sprout. When the soil moisture content is below 1.0%, it is a question for adventitious roots to sprout. The adventitious roots was able to sprout on the 2 year old stolon on the condition in which the sand is easily accumulated, even on the 9 year old stolon on the medium and great thickness of sand layer. This indicates that the age is not the key factor for restricting the adventitious roots to sprout.
文摘In order to reveal the physiological reaction and adaptability of natural Sabina vulgaris community to sandy environment in different successional stages, we determined physiological index of drought_resistance of S.vulgaris under different successional stages by colorimetry in TuKe of Mu Us Sandland. The results showed that with the process of the succession, PRO and MDA contents increase first, and then decrease during the process of the succession. The variance analysis showed that the difference of the PRO contents among stages is more significant. The difference of the SOD and POD activity is more significant among stages, but the CAT activity has no significant change. In the fourth successional stage, the contents of MDA and PRO increase, the activity of SOD and POD increase. All of them show the physiological characters of damaged plant under the environment hardness. The correlation analysis between PRO、MDA and protective enzymes activity showed: the positive correlation of the change of SOD、POD activity with the change of MDA contents is significant. The decrease of MDA will increase protective enzymes activity which in the leaf. The response of the physiological index to the environment hardness in different successional stage is not similar. First, some damaged characters appeared in the fourth stage; second, some index are stable in the third stage. It indicated that the third stage is a stable period.
