阿拉善高原土地砾化特征及监测指标. (Chinese)

Foundation data from which to develop indicators to monitor and evaluate the graveling land of the Alxa Plateau is required. To address this, the characteristics of surface gravel coverage (Gc), surface gravel mass per unit area (Gm), gravel mass content in the 0-5 and 5-10 cm soil depths [Gmc (0-5 cm), Gmc (5-10 cm)], and their relationships in the land graveling areas of the Alxa Plateau were assessed and analyzed using one- way analysis of variance, Duncan multiple comparisons, univariate linear regression, and correlation analysis. The average total Gc was 39.49% and the average total Gm was 3544.04 g·m -2 . The Gc and Gm values at 4-8 and 8-16 mm were significantly higher when compared with the other particle sizes (P < 0.05). The coefficients of variation for Gc and Gm with a particle size of 4-8 mm were the smallest and most stable. The spatial distribution patterns of the Gc and Gm showed gradual increases from east to west and south to north. Different particle sizes (total) of the Gm and Gc showed extremely significant linear regression (P < 0.01), Gm could also be a good evaluation of the land graveling level. According to the classification threshold at the graveling level for Gc, the corresponding classification for Gm was determined. Except for the 2- 4 mm and > 32 mm particles, the correlations between particle sizes in the Gc, Gm, and Gmc in the 0-5 cm soil layer were significantly greater when compared with the 5-10 cm soil layer, and the correlations between total Gc, Gm, and Gmc in the 0-5 cm soil layer were significantly greater when compared with the 5-10 cm soil layer. A surface gravel coverage threshold of 25% was determined for the Gobi, which is a graveling land type. The results of this study provide indicator data on which to base the monitoring and assessment of graveling land in the Alxa Plateau and other regions. [ABSTRACT FROM AUTHOR]

探究阿拉善高原土地砾化地区的地表砾石覆盖度 (Gc ), 单位面积地表砾石质量 (Gm), 0~5 cm, 5~10 cm土 层深度的砾石质量含量 [Gmc(0~5 cm), Gmc(5~10 cm)] 特征及其相关关系，为其砾化土地的监测与评估奠定指标基 础。野外采集阿拉善高原土地砾化地区的砾石样品，测定其Gc, Gm, Gmc(0~5 cm)和Gmc(5~10 cm)。通过单因素方差分 析, 邓肯多重比较, -元线性回归和相关性分析，探究阿拉善高原的土地砾化特征。结果表明： (1) 阿拉善高原各样 地总的G (c Gm) 的平均值为39.49% (3544.04 g·m-2). (2) 粒径为4~8 mm和8~16 mm的G (c Gm) 要显著高于其他粒径的 G (c Gm) (P<0.05), 且粒径为4~8 mm的G (c Gm) 变异系数最小，最为稳定. (3) 阿拉善高原各样地在空间分布格局上呈 现出Gc和Gm由东向西, 由南向北逐渐增大的分布规律. (4) 不同粒径 (总) 的Gm和Gc均呈极显著的-元线性回归关 系 (P<0.01), Gm也可以很好的评价土地砾化程度。并根据Gc的砾化程度分级阈值确定了相应的Gm的砾化程度分级 阈值. (5) 除2~4 mm和>32 mm的粒径外，其他粒径的Gc, Gm与0~5 cm土层内Gmc的相关性要明显大于与5~10 cm土 层内Gmc的相关性，总的Gc, Gm与0~5 cm土层内Gmc的相关性要明显大于与5~10 cm土层内Gmc的相关性. (6) 确定了 砾化土地类型之-的戈壁地表砾石覆盖度阈值为25%。研究结果可为阿拉善高原和其他区域砾化土地的监测和 评估奠定指标基础. [ABSTRACT FROM AUTHOR]

Copyright of Arid Zone Research / Ganhanqu Yanjiu is the property of Arid Zone Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)