ABSTRACT This study is an attempt to evaluate the relationships between vegetation and modern pollen rain in Siaha District, Southern Mizoram, India, as a contribution to palaeoecological research. A set of 21 pollen substrates (surface soil and moss pollsters) were obtained from the vicinity of Pala Lake, the biggest natural lake in Mizoram. Two thick spider web samples were also incorporated to measure the degree of trapped airborne palyno-debris as compared to the moss-soil data. The total pollen rain reflects the site-to-site variation in the pollen assemblages as shown by their abundances – 38%, 26% and 27% from the forest, forest margin and open land, respectively. The spider web samples also contribute 9% of palynomorphs to the total pollen assemblage. The total pollen rain revealed the dominance of non-arboreal pollen (NAP: 56%) over arboreal pollen (AP: 27%). The data showed a partial correlation with the extant woody vegetation; however, two major arboreal taxa – Dipterocarpus and Xerospermum – are under-represented despite their prominence in the near vicinity. The presence of highland taxa such as Tsuga and Carya indicates long-distance pollen transport. The abundance of monolete and trilete ferns also suggests a prevalent humid depositional environment. Fungal spores mainly constitute the non-pollen palynomorphs (NPP) assemblage. Low representation of dominant tree taxa in the pollen assemblages, even in the samples proximal to the forest, can be attributed to the entomophilous nature of the trees (Emblica and Artocarpus species). The extant palynoflora recovered in different surface substrates are suggestive of differential pollen production, dispersal and deposition.

中文翻译：

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来自印度东北部南部米佐拉姆邦 Siaha 区帕拉湿地保护区森林的现代花粉光谱

摘要 本研究试图评估印度米佐拉姆邦南部 Siaha 区植被与现代花粉雨之间的关系，作为对古生态研究的贡献。从米佐拉姆邦最大的天然湖泊帕拉湖附近获得了一组 21 种花粉基质（表层土壤和苔藓花粉）。与苔藓土壤数据相比，还加入了两个厚蜘蛛网样本，以测量捕获的空气传播孢粉碎片的程度。总花粉雨反映了花粉组合的站点间差异，如它们的丰度所示——分别来自森林、林缘和开阔地的 38%、26% 和 27%。蜘蛛网样本也对总花粉组合贡献了 9% 的孢粉型。总花粉雨揭示了非树栖花粉的主导地位（NAP：56%）超过树栖花粉（AP：27%）。数据显示与现存的木本植被有部分相关性；然而，两个主要的树栖类群——龙脑香和 Xerospermum——尽管在附近很突出，但它们的代表性不足。高地类群如津贺和山核桃的存在表明花粉的长距离运输。丰富的单叶蕨和三叶蕨也表明普遍存在潮湿的沉积环境。真菌孢子主要构成非花粉孢粉 (NPP) 组合。花粉组合中优势树类群的低代表性，即使在靠近森林的样本中，也可归因于树木（余甘子和 Artocarpus 物种）的虫媒性质。在不同表面基质中恢复的现存孢粉菌群表明花粉生产存在差异，