摘要
黄河三角洲土壤水盐变化剧烈,为探究当地柽柳灌丛土壤水盐变化特征及其影响因素,以恢复柽柳群落生态,在黄河三角洲选定长势较差(N1)和较好(N2)的2处天然柽柳林,对比分析两处地下水状况、土壤含水率、盐分富集率及Cl–、Na+的时空变化。结果表明:(1)N2样地地下水平均埋深和矿化度都大于N1样地;(2)雨季时N2样地土壤含水率高于N1样地,旱季则相反,尤以内围区(距植株水平距离0~30 cm)更明显;(3)两地土壤盐分皆随土壤深度增加而递减,在雨季和旱季分布呈“盐谷”和“盐岛”特征,且N2样地的“盐谷”效应强于N1样地;(4)雨季时N2样地内围区Cl–、Na+含量整体低于外围区(距植株水平距离30~90 cm),呈“左–右”空间分异,而N1样地呈“上–下”空间分异,再次说明N2样地雨季“盐谷”效应更强。综上,柽柳形成“盐谷/岛”效应是其适应高盐环境的重要策略。因此,通过柽柳适生种植,促进柽柳冠层生长以增强“盐谷/岛”效应是确保柽柳群落恢复和稳定的有效措施。
There is an apparently variation of soil moisture and salinity in the Yellow River Delta. In order to explore the characteristics and influencing factors of the variation to restore the ecology of local Tamarix community, the two natural Tamarix forests, poorly-developed(N1) and well-developed(N2) states were selected, the groundwater table depths and salinity, soil moistures and salinity, salt enrichment ratios and Cl– and Na+ contents at the two sites were compared and analyzed. The results show that the salinity of groundwater at N2 site is higher than N1 site, and its average groundwater table is lower than N1 site. Soil moisture is higher at N2 site than N1 site in rainy season but lower at N2 site than N1 site in dry season, especially in the inner region(distance from the plant is 0–30 cm). Soil salinity is decreased with soil depth at the two sites, and “salt valley” and “salt island” is appeared in rainy and dry seasons, respectively. “Salt valley” at N2 site is stronger than N1 site. During the rainy season,the contents of Cl– and Na+ in the inner region is generally lower than those in the outer region(distance from the plant is 30–90 cm) with the “left-right” spatial distribution at N2 site. Whereas, the “up-down” spatial distribution is appeared at N1 site,which further illustrated that “salt valley” effect is more obvious at N2 site in the rainy season. In conclusion, “salt valley” and “salt island” effects are the crucial strategy for Tamarix Chinensis adapting to heavily saline habitat. Therefore, it is an effective way to apply suitable planting regime for tamarisk, to promote the growth of canopy for enhancing “salt valley and island” effects,which are beneficial to the stability of tamarisk community and the restoration of saline-alkali soil.
作者
胡鑫隆
齐继
于千钧
刘金娣
潘英华
陈小兵
胡秋丽
赵英
HU Xinlong;QI Ji;YU Qianjun;LIU Jindi;PAN Yinghua;CHEN Xiaobing;HU Qiuli;ZHAO Ying(College of Resources and Environmental Engineering,Ludong University,Yantai,Shandong 264025,China;Key Laboratory of Coastal Ecohydrological Processes and Environmental Security,Yantai,Shandong 264025,China;Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai,Shandong 264003,China)
出处
《土壤》
CAS
CSCD
北大核心
2022年第6期1291-1299,共9页
Soils
基金
国家自然科学基金项目(41901031)
山东省杰出青年基金项目(ZR2019JQ12)资助。
关键词
柽柳
土壤水分
土壤盐分
时空变化
黄河三角洲
Tamarix chinensis
Soil moisture
Soil salinity
Temporal and spatial variation
Yellow River Delta
