中国东北地区年平均降水量 400 毫米等降水量线和 600 毫米等降水量线地表土壤中植物碎屑组合的比较

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Hongyan Liu, Dongmei Jie, Lidan Liu, Guizai Gao, Dehui Li, Nannan Li
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引用次数: 0

摘要

目的 在古环境重建中成功应用植物岩石的先决条件是正确解释其环境意义。在这方面,关键问题包括需要多大的温度/降水量变化才能使表层土壤植物岩石的百分比发生显著变化?当温度/降水量增加到一定程度时,表层土壤植化石的百分比和组合会有什么相应的反应?材料与方法 我们分析了在中国东北地区年平均降水量(MAP)为 400 毫米(年平均气温(MAT)范围为 3.24℃)和 600 毫米(年平均气温(MAT)范围为 8.29℃)的等降水量线上采集的 90 个表层土壤样品中的植金石。我们的目的是确定植金石对不同温度梯度的响应。采用重液分离法和显微镜观察法提取并鉴定了土壤中的植金石。结果植金石百分含量的DA值可将沿两个等温线采集的样品进行分离,总准确率为94.44%。MAT是影响植生石空间分布的主要因素,解释率为46.40%。在沿两个等距线采集的表层土壤样本中,ELONGATE、ACUTE BULBOSUS 和 PTERIDOPHYTE-TYPE 形态的百分比与 MAT 呈显著负相关,而 SQUARE 形态的百分比与 MAT 呈显著正相关。然而,藻类的百分比与 MAT 的关系各不相同,既有正相关,也有负相关。约 3℃的温度梯度不足以显著影响 SADDLE、BULLIFORM FLABELLATE 和 BILOBATE 的百分比。植被指数(C/W)可以有效地重建中国东北地区的古气候。MAP变化200 mm时,ELONGATE、SADDLE、BULLIFORM FLABELLATE和TRACHEARY的比例发生了显著变化(分别为39.57%、780.77%、179.00%和81.25%)。结论 我们的研究结果有助于更好地理解各种植物形态类型对温度的响应,并为该地区未来基于植物形态的古气候重建提供了现代过程基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A comparison of phytolith assemblages in surface soils along the 400-mm and 600-mm mean annual precipitation isohyets in Northeast China

A comparison of phytolith assemblages in surface soils along the 400-mm and 600-mm mean annual precipitation isohyets in Northeast China

Purpose

A prerequisite for the successful application of phytoliths in paleoenvironmental reconstruction is the correct interpretation of their environmental significance. In this context, key questions include: What magnitude of temperature/precipitation change is required to effect significant changes in surface soil phytolith percentages? When temperature/precipitation increases by a certain amount, what is the corresponding response of the percentages and assemblages of surface soil phytoliths? Additional detailed research is required to answer these questions.

Materials and methods

We analyzed the phytoliths in 90 surface soil samples collected along the isohyets corresponding to the mean annual precipitation (MAP) of 400 mm (with the mean annual temperature (MAT) range of 3.24℃) and 600 mm (with the MAT range of 8.29℃) in Northeast China. Our objective was to determine the response of phytoliths to different temperature gradients. Soil phytoliths were extracted and identified using heavy liquid separation and microscope observations.

Results

The DA of the phytolith percentages enabled the separation of samples collected along the two isohyets, with a total accuracy of 94.44%. MAT was the principal factor affecting the spatial distribution of phytoliths, with an explanation rate of 46.40%. In the surface soil samples collected along the two isohyets, the percentages of ELONGATE, ACUTE BULBOSUS, and PTERIDOPHYTE-TYPE morphotypes, were significantly negatively correlated with MAT, while the percentages of SQUARE were significantly positively correlated with MAT. However, the relationship between PAPILLATE percentages and MAT varied, showing both positive and negative correlations. A temperature gradient of ~ 3℃ was insufficient to significantly affect the percentages of SADDLE, BULLIFORM FLABELLATE, and BILOBATE. The phytolith index (C/W) can be effectively used to reconstruct the palaeoclimate in Northeast China. An MAP change of 200 mm resulted in significant changes in the percentages of ELONGATE, SADDLE, BULLIFORM FLABELLATE, and TRACHEARY (with the respective rates of 39.57%, 780.77%, 179.00% and 81.25%). However, the percentages of ACUTE BULBOSUS, SQUARE, RONDEL, BILOBATE, CRENATE, PTERIDOPHYTE-TYPE, SILICIFIED STOMATA, and PAPILLATE did not change significantly.

Conclusions

Our results contribute to an improved understanding of the response of various phytolith morphotypes to temperature, and they provide a modern process basis for future phytolith-based paleoclimatic reconstruction in this region.

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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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