ZHAO Shenglong,ZENG Fanjiang,ZHANG Bo,et al.Effects of Burning and Cutting on Leaf Ecological Stoichiometry Characteristics of Alhagi sparsifolia[J].Research of Soil and Water Conservation,2017,24(01):84-89.
火烧和砍伐对疏叶骆驼刺叶片生态化学计量特征的影响
- Title:
- Effects of Burning and Cutting on Leaf Ecological Stoichiometry Characteristics of Alhagi sparsifolia
- Keywords:
- Alhagi sparsifolia; cutting; burning; N; P; K; dynamic variation
- 分类号:
- Q945.79
- 摘要:
- 以塔克拉玛干沙漠南缘绿洲—沙漠过渡带的优势植物——疏叶骆驼刺为研究对象，设置春季砍伐、春季火烧、秋季砍伐和对照处理，研究了干扰对疏叶骆驼刺叶片N，P，K生态化学计量特征的影响。结果表明：春伐和火烧处理下，疏叶骆驼刺叶片N，P和K含量随季节变化显著降低，而N∶P无明显差异；秋伐处理下，叶片N含量及N∶P先降低后上升，K含量先升高后降低，P含量则无明显差异。不同干扰下疏叶骆驼刺叶片N，P，K含量及其N∶P的季节变异分析显示，火烧处理下其N，P，K季节变异最大，分别为：22.32%，20.43%，28.27%；春伐处理下，N及N∶P季节变异最小，分别为16.29%，8.67%；秋伐处理下P季节变异最小，为8.64%；对照处理下，K季节变异最小，为8.11%，N∶P季节变异最大，为24.26%。生长季节与干扰处理对疏叶骆驼刺叶片N，P，K含量及其N∶P影响的方差分析显示，疏叶骆驼刺叶片N及N∶P主要受生长季节与干扰的交互作用影响，而P及K含量主要受生长季节的影响。
- Abstract:
- Taking the dominant plant Alhagi sparsifolia at the southern fringe of Taklimakan Desert as sample, we examined the effects of different disturbances treatments (cutting in spring, cutting in fall and burning in spring) on leaf N, P and K ecological stoichiometry characteristics. The results showed that N, P and K concentrations of Alhagi sparsifolia leaf were significantly lower under cutting in spring and burning treatments along with the seasonal variation, while N∶P mass ratio was no obvious variation. The N concentration and N∶P mass ratio of leaf first decreased and then increased, and K concentration first increased then decreased under cutting in fall treatments, at the same time, P concentration was no obvious variation. Based on variation analysis among different seasons within different treatments of Alhagi sparsifolia leaf, N, P, K concentrations were more seasonal dynamic under the treatment of burning in spring than the other treatments, which were 22.32%, 20.43%, 28.27%, respectively, seasonal dynamics of N concentration and N∶P mass ratio under treatment of cutting in spring were less than the other treatments, which were 16.29%, 8.67%, respectively. P concentration under the treatment of cutting in fall was less seasonal dynamic than the other treatments, which was 8.64%. K concentration was less seasonal dynamic and in N∶P mass ratio was more seasonal dynamics under control treatment than the other treatments, which were 8.11%, 24.26%, respectively. With growth stage and treatments as independent factors, factorial analysis of variation for N, P and K concentrations and N∶P mass ratio showed that Alhagi sparsifolia leaf N concentration and N∶P mass ratio were mainly determined by an interaction between growth stage and disturbance, while leaf P and K concentrations were mainly determined by growth stage of plant.
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备注/Memo
收稿日期:2015-11-05;改回日期:2015-12-04。
基金项目:新疆自治区科技重大专项（201130106-1）；国家基金委—新疆联合基金重点项目（U1203201）；国家自然科学基金（41371516）
作者简介:赵生龙(1989-),男,甘肃永登县人,硕士研究生,研究方向为荒漠植物生理生态。E-mail:13619398146@163.com
通讯作者:曾凡江(1966-),男,河南镇平人,研究员,博士生导师,主要从事荒漠植物生理生态研究。E-mail:zengfj@ms.xjb.ac.cn