模拟石漠化异质生境中桑树的生长和叶绿素荧光特性

黄小辉; 冯大兰; 刘芸; 朱恒星; 陈道静; 耿养会

doi:10.13332/j.1000-1522.20150324

模拟石漠化异质生境中桑树的生长和叶绿素荧光特性

doi: 10.13332/j.1000-1522.20150324

1.
1 重庆市林业科学研究院
2.
2 西南大学资源环境学院

基金项目:

重庆市基本科研业务费(2013cstc-jbky-00702)、国家自然科学基金项目(31370602)。

详细信息

作者简介:
黄小辉。主要研究方向:城市林业与森林生态。 Email: huangxiaohui4260@163.com 地址:400036重庆市沙坪坝区重庆市林业科学研究院。
责任作者: 冯大兰,高级工程师。主要研究方向:土壤营养。 Email:fengdalang@163.com 地址:同上。

黄小辉。主要研究方向:城市林业与森林生态。 Email: huangxiaohui4260@163.com 地址:400036重庆市沙坪坝区重庆市林业科学研究院。
责任作者: 冯大兰,高级工程师。主要研究方向:土壤营养。 Email:fengdalang@163.com 地址:同上。

Growth and chlorophyll fluorescence characteristics of mulberry trees in simulated environment of heterogeneous habitats of a rocky desertification area.

1.
1 Chongqing Academy of Forestry, Chongqing, 400036, P. R. China;
2.
2 College of Resources and Environment, Southwest University, Chongqing, 400716, P. R. China.

摘要: 模拟石漠化生境不同的土壤水肥条件,设置H(水分差异)、F(肥力差异)、HF(水肥差异)和 CK组(对照)4个异质处理组,观察桑树根系在石漠化异质生境中的生长情况,探讨其根系活动对地上部分的生长及叶绿素荧光特性的影响。结果表明:桑树根系在土壤异质条件中具有明显的向水性和向肥性,但在干旱少水的条件下根系未有向肥性;H和HF组桑树根系发生了明显的向性运动,以此获得充足的水分,而F和CK组桑树的根系无向水性和向肥性运动,以致长期处于干旱条件中,但未发现死亡现象;各处理组地上和地下部分的总体生长情况以HF组最好,其次是H、F和CK组明显较差;F和CK组叶片的光合色素含量、最大光化学效率(Fv/Fm)、有效光化学效率(F′v/F′m)、电子传递速率(ETR)、实际光化学效率(ΦPSII)和光化学猝灭系数(qP)等参数均显著低于HF和H组,且前两者NPQ值较高。可见,在石漠化异质生境中,水分是制约桑树存活及生长的关键因子,但桑树根系能够通过向性生长,获得充足的水分和营养以维持良好的生长。
- 石漠化 /
- 干旱 /
- 桑树 /
- 向水性 /
- 向肥性 /
- 叶绿素荧光参数
Abstract: The tropic growth of mulberry roots in response to different water and nutrient conditions was studied in a simulated rocky desertification habitat. Four treatment groups were compared, including group H (variable moisture), group F (variable nutrients), group HF (both moisture and nutrients varying) and group CK (control), which were designed to simulate the heterogeneous soil conditions associated with rocky desertification. The experiment was conducted to study the influence of root tropisms on the growth and chlorophyll fluorescence characteristics of mulberry trees that grew in the stressful environment. The results showed that: 1) the roots of mulberry trees showed obvious hydro-tropism and fertilizer-tropism, but the fertilizer-tropism of mulberry roots did not occur in the condition of moisture shortage. 2) The mulberry roots in group H and HF both showed obvious tropic growth that promoted absorption to water for its growth, while in the group F and CK, roots showed no tropism characteristics and the trees grew under the drought conditions for a long term, maintaining a high root-shoot ratio. 3) Root surface area, total root length, number of root tips, root biomass, leaf area, plant height, basal diameter, crown width, and above-ground biomass of mulberry trees in each group were measured and compared, and these indices showed that the growth status of mulberry trees in group HF was the best, followed by those in group H. Group F and CK were significantly poorer. 4) The photosynthetic pigment contents, chlorophyll a, chlorophyll b and carotenoid of mulberry trees in group F and CK were both significantly lower than those in group H and HF. Chlorophyll fluorescence parameters (Fv/Fm, F′v/F′m, ΦPSII and ETR) of mulberry trees in group F and CK were significantly lower than those in group H and HF. The photochemical quenching coefficients (qP) of mulberry trees in group F and CK were significantly lower than those in group H and HF, by contrast with the non-photochemical quenching coefficients (NPQ), which were higher. These results indicated that in the rocky desertification area, water is the key factor that restricts live and growth of mulberry trees. Nevertheless, the mulberry trees can get enough water and nutrients due to root tropism and they show favorable growth characteristics.
- rocky desertification /
- drought /
- mulberry trees /
- hydro-tropism /
- fertilizer-tropism /
- chlorophyll fluorescence parameters

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模拟石漠化异质生境中桑树的生长和叶绿素荧光特性

doi: 10.13332/j.1000-1522.20150324

Growth and chlorophyll fluorescence characteristics of mulberry trees in simulated environment of heterogeneous habitats of a rocky desertification area.

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模拟石漠化异质生境中桑树的生长和叶绿素荧光特性

doi: 10.13332/j.1000-1522.20150324

1. 1 重庆市林业科学研究院

2. 2 西南大学资源环境学院

English Abstract

Growth and chlorophyll fluorescence characteristics of mulberry trees in simulated environment of heterogeneous habitats of a rocky desertification area.

1. 1 Chongqing Academy of Forestry, Chongqing, 400036, P. R. China;

2. 2 College of Resources and Environment, Southwest University, Chongqing, 400716, P. R. China.

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模拟石漠化异质生境中桑树的生长和叶绿素荧光特性

doi: 10.13332/j.1000-1522.20150324

Growth and chlorophyll fluorescence characteristics of mulberry trees in simulated environment of heterogeneous habitats of a rocky desertification area.

计量

出版历程

模拟石漠化异质生境中桑树的生长和叶绿素荧光特性

doi: 10.13332/j.1000-1522.20150324

1. 1 重庆市林业科学研究院 2. 2 西南大学资源环境学院

English Abstract

Growth and chlorophyll fluorescence characteristics of mulberry trees in simulated environment of heterogeneous habitats of a rocky desertification area.

1. 1 Chongqing Academy of Forestry, Chongqing, 400036, P. R. China; 2. 2 College of Resources and Environment, Southwest University, Chongqing, 400716, P. R. China.

全文HTML

目录

1. 1 重庆市林业科学研究院

2. 2 西南大学资源环境学院

1. 1 Chongqing Academy of Forestry, Chongqing, 400036, P. R. China;

2. 2 College of Resources and Environment, Southwest University, Chongqing, 400716, P. R. China.