Isodon calcicola var. subculva
Biochemistry & Molecular Biology; Plant Sciences
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Mint family (Plants)
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AbstractFour new diterpenoids, calcicolins B-E, together with five known diterpenoids, calcicolin A, weisiensin A, adenanthin, forrestin C and nervosanin, have been isolated from the leaves of Isodon calcicola var. subculva. The new compounds were determined as 1 alpha, 3 beta-dihydroxy-7 beta, 11 beta-diacetoxy-ent-kaur-16-en-6,15-dione; la, 11 beta-diacetoxy-3 beta, 6 beta-dihydroxy-ent-kaur-16-en-15-one; 1 alpha, 6 alpha, 7 beta, 11 beta-tetraacetoxy-3 beta, 15 beta-dihydroxy-ent-kaur-16-ene, and 1 alpha, 6 alpha, 11 beta, 15 beta-tetra-acetoxy-3 beta, 7 beta-dihydroxy-ent-kaur-16-ene by means of spectrometry, including 2D NMR techniques. (C) 1998 Elsevier Science Ltd. All rights reserved.
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Changes in Soil Properties before and after Wetland Degradation in the Yellow River Delta, ChinaHuang, C; Bai, JH; Shao, HB; Gao, HF; Xiao, R; Huang, LB; Liu, PP (2012-10)The aim of this study is to determine whether wetland degradation in the Yellow River Delta has an effect on its soil properties. Twenty soil samples collected from degraded and undegraded wetlands were analyzed using hierarchical cluster analysis and principal correspondence analysis. The statistical analyses revealed that soil samples from both degraded and undegraded wetlands could be clearly distinguished according to their properties. These soil properties such as nitrate nitrogen, ammoniac nitrogen, and pH showed significant changes after wetland degradation than before. However, degraded wetland soils did not exhibit significant changes in electric conductivity (EC) and soil organic matter (SOM). Six soil properties excluding EC and SOM were transformed to establish a simplified chemical index of soil degradation (CDI) for evaluating wetland soil quality before and after wetland degradation. Lower CDI values of undegraded wetland soils were observed than those of degraded wetland soils. The methods used in this study can be further used in larger areas to evaluate and monitor the degradation status of wetlands, and can contribute to wetland management and restoration practices.