宋 音,王 红,路开宇,仲 懿

(1.河海大学 地球科学与工程学院,江苏 南京 211100;2.江苏省南京莱斯信息技术股份有限公司,江苏 南京 210014)

基于CCA方法的黄河三角洲不同健康刺槐林的土壤属性研究

宋 音1,王 红1,路开宇2,仲 懿1

(1.河海大学 地球科学与工程学院,江苏 南京 211100;2.江苏省南京莱斯信息技术股份有限公司,江苏 南京 210014)

通过对不同健康状况(健康、中度枯梢、重度枯梢或死亡)刺槐林的生态调查、林下土壤采样,分析了不同健康林地不同采样深度(0～260 cm)的土壤属性差异性及变化特征。研究结果表明：(1)土壤水分和盐分含量在不同健康状况刺槐林地间存在显著的差异,且随着刺槐林退化程度的加深,土壤水分、盐分、粘粒含量和容重显著地增加;(2)在相同健康状况林地的不同土层间,只有土壤颗粒含量存在显著性的差异;(3)随着采样深度的增加,土壤颗粒显著变粗,土壤水分则显著地减少(在健康林地)或增加(在重度枯梢林地),土壤盐分则具有明显的表聚性。采用典范对应分析方法进行分析,发现刺槐林的健康属性与土壤属性相关性大,且土壤水分和盐分是影响刺槐林健康状况的最重要的土壤属性因素；由地下水位抬升而导致的土壤含水量增加是刺槐林退化的最重要因素。

土壤；属性;健康状况;刺槐林;典范对应分析法;黄河三角洲

Abstract： The soil properties ofRobiniapseudoacaciaforests with different health statuses (health, medium dieback, and severe dieback or death) in the Yellow River delta were studied through ecological survey and soil layer (0～260 cm) sampling based on canonical correspondence analysis (CCA). The results indicated that there were significant differences in soil moisture and salinity contents amongR.pseudoacaciaforests with different health statuses, and the soil moisture, salinity and clay particle contents, as well as the soil bulk density increased significantly with the continuous degradation ofR.pseudoacaciaforest. There was a significant difference only in soil particle content among different soil layers ofR.pseudoacaciaforest with the same health status. Along with the increase in soil layer depth, the soil particle size was significantly increased, while the soil moisture content was significantly reduced (in healthy forest land) or increased (in severe dieback forest land). The soil salinity was obviously accumulated in the topsoil. The canonical correspondence analysis showed that the health status ofR.pseudoacaciaforest was well correlated with the soil properties, and soil moisture and soil salinity were the most important soil property factors affecting the health status ofR.pseudoacaciaforest. The increase in soil moisture content caused by the upraising of underground water level was the most important cause for the degradation ofR.pseudoacaciaforest.

Keywords： Soil; Property; Health status;Robiniapseudoacaciaforest; Canonical correspondence analysis; Yellow River delta

2.3 槐耳清膏对NCI-N87细胞相关自噬蛋白表达的影响 通过RT-PCR和Western blot对自噬相关蛋白Beclin-1、LC3-II、PTEN mRNA和蛋白水平进行了检测，结果表明，与对照组相比，槐耳清膏作用 NCI-N87 细胞 24h 后，Beclin-1、LC3-II、PTEN mRNA水平和蛋白表达水平逐渐升高，均有统计学意义（P＜0.05）。……