【题目】阅读图文资料，完成下列要求.
材料：河流的侵蚀、沉积及沼泽的吸收（附）影响河流泥沙和营养物质含量，水体中营养物质含量影响浮游生物量，与水温共同制约鱼类资源数量。图7所示的西西伯利亚平原地势低平，冻土发育，沼泽广布。
（1）分析西西伯利亚平原沼泽广布的原因
（2）分析叶尼塞河泥沙含量较多，而鄂毕河泥沙含量较少的原因。
（3）通常，大河河口的鱼类资源丰富，但鄂毕河河口鱼类资源相对较少。说明鄂毕河河口鱼类资源较少的原因。
【答案】（1）地势低平，排水不畅；气温低，蒸发量小；下部土层冻结（永冻层），阻滞水分下渗；（凌汛等导致）河水泛滥。（8分）
（2）叶尼塞河支流多流经中西伯利亚高原，（河床比降大）流速快，侵蚀强，增加了河流含沙量。鄂毕河主要流经平原，流速慢，泥沙沉积，含沙量小。（4分）
（3）鄂毕河河口区纬度高，水温低，鱼类生长慢。结冰期长，鱼类存活率偏低。鄂毕河流经沼泽，营养物质被植物吸收，河水中营养物质严重缺乏，不利于浮游生物生长。北冰洋营养物质和饵料较为贫乏。（4分，两点满分）
【解析】
试题分析：
（1）西西伯利亚平原沼泽广布的原因，可以从降水、蒸发、排水、植被、冻土等方面回答。
（2）叶尼塞河泥沙含量较多，而鄂毕河泥沙含量较少的原因，可以从流域面积、植被、支流等方面回答。
（3）鄂毕河河口鱼类资源较少的原因，可以从含沙量。饵料、冰期、存活率等方面回答。
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