不同年龄阶段陈山红心杉人工林土壤理化性质

随着林龄的增加，陈山红心杉土壤逐渐酸化，pH 值在4.0 ～ 4.8 之间，土质为粉砂土壤，机械组成为粉粒＞砂粒＞黏粒。全C 含量随林龄增加逐渐积累，全N 含量先增加后略微降低，到34 a 后上升，全P 含量逐渐降低，但到34 a 时有所上升。全K 含量随林龄的增加表现为先上升再下降再上升趋势，全Ca 含量则为先升后降趋势，全Mg 含量为上升趋势。土壤中微量元素含量为交换性Al ＞全Mn ＞有效Fe ＞全Ba ＞全Zn ＞全Li ＞全Cu ＞全Sr ＞全Bi ＞全Sn ＞全As ＞全Ti，其含量变化随着林龄的增加变化规律不明显。机械组成成分之间相关性较强（P ＜ 0.05），全C含量与全N、全Ca 含量呈极显著正相关，与全Mg、全P 含量呈显著正相关（P ＜ 0.05），全Ca 含量与全N、全Mg 含量呈极显著正相关（P ＜ 0.01），微量元素之间相关性呈现多样性。机械组成对土壤pH 值和大量元素（全C、全N、全P、全Ca 和全Mg）含量有显著的影响。陈山红心杉人工林土壤显示出一定的土壤P限制，因此在未来的红心杉人工林可持续经营过程中，需要添加一定量的P 元素。在红心木材长期演替过程中，微量元素含量，特别是Fe 元素含量可能是红心杉红心材形成的影响因子之一，因此在未来研究中可以深入对比红心杉与普通杉木不同器官对于养分积累与土壤之间元素相关性的差异分析，探讨红心杉红心材的形成机理。With increasing stand age, the soil under Chenshan red-heart Chinese fir undergoes gradual acidification, with pH values ranging from 4.0 to 4.8. The soil texture is silty sand, and its mechanical composition follows the order of silt content > sand content > clay content. Total carbon (TC) content gradually accumulates with increasing stand age. Total nitrogen (TN) content first increases, then slightly decreases, and rises again after 34 years. Total phosphorus (TP) content gradually declines but shows an increase at 34 years. Total potassium (TK) content exhibits a trend of first increasing, then decreasing, and finally increasing again with stand age. Total calcium (TCa) content follows a pattern of initial increase followed by a decrease, while total magnesium (TMg) content shows an upward trend. The order of trace element contents in the soil is exchangeable Al > total Mn > available Fe > total Ba > total Zn > total Li > total Cu > total Sr > total Bi > total Sn > total As > total Ti. The changes in these trace element contents show no distinct regular patterns with increasing stand age. There are strong correlations among the mechanical composition components (P < 0.05). Total C content shows an extremely significant positive correlation with total N and total Ca contents, and a significant positive correlation with total Mg and total P contents (P < 0.05). Total Ca content exhibits extremely significant positive correlations with total N and total Mg contents (P < 0.01). Correlations among trace elements show diversity. Mechanical composition has significant effects on soil pH and the contents of macronutrients including total C, total N, total P, total Ca and total Mg. The soil under Chenshan red-heart Chinese fir plantations shows certain phosphorus (P) limitation. Therefore, a certain amount of P fertilizer should be added during the sustainable management of these plantations in the future. During the long-term succession of red-heart wood, trace element contents, especially iron (Fe) content, may be one of the influencing factors for the formation of red-heart wood in Chenshan red-heart Chinese fir. Therefore, future studies can conduct in-depth comparative analyses of the differences in nutrient accumulation and element correlations between soil and different organs of Chenshan red-heart Chinese fir and ordinary Chinese fir, to explore the formation mechanism of red-heart wood in this variety.

搜集汇总

背景与挑战

背景概述

该数据集研究了陈山红心杉人工林土壤理化性质随林龄变化的规律，包括土壤酸化趋势、机械组成以及大量和微量元素含量的动态变化。分析揭示了元素间的相关性、机械组成对土壤性质的影响，并指出土壤存在磷限制，铁元素可能参与红心材的形成过程。