黄河三角洲新生湿地净初级生产力时空变化

生态学杂志

黄河三角洲新生湿地净初级生产力时空变化

路广,韩美^*,徐泽华,朱继前,牛学锐

(山东师范大学地理与环境学院，济南 250358)

出版日期:2019-04-10 发布日期:2019-04-10

Spatiotemporal variations of net primary productivity in new wetlands of the Yellow River Delta.

LU Guang, HAN Mei^*, XU Ze-hua, ZHU Ji-qian, NIU Xue-rui

(College of Geography and Environment, Shandong Normal University, Ji’nan 250358, China).

Online:2019-04-10 Published:2019-04-10

摘要/Abstract

摘要： 以黄河三角洲新生湿地为研究区，结合野外调查和遥感影像数据，利用CASA(CarnegieAmes Stanford Approach，CASA)模型对近20年新生湿地植被净初级生产力(net primary production，NPP)时空变化特征及其主要影响因素进行研究。结果表明：研究区植被NPP实测值与估算值显著相关（P<0.001），相对误差介于-21.96～8.16；研究区植被NPP呈现由海向陆递增，由河流沿岸向外围递减趋势；1998—2016年研究区植被NPP均值、总量整体呈下降趋势，植被NPP均值变化较小，但植被NPP总量变化明显，1998年植被NPP总量最大，2010年植被NPP总量最小；研究区四季植被NPP变化明显，春季植被NPP均值为74.25 g C·m^-2，夏季为101.58 g C·m^-2，秋季为41.83 g C·m^-2，冬季为13.10 g C·m^-2；研究区不同植被NPP估算值差异显著，各类植被NPP均值估算结果大小为刺槐群落>芦苇柳树群落>农作物>芦苇荻白茅群落>芦苇柽柳群落>柽柳群落>碱蓬群落>大米草互花米草群落>柽柳碱蓬白茅群落；研究区植被NPP与土壤可溶性盐相关系数为-0.389(P<0.01)，合理的“调水控盐”模式可以降低土壤盐度，促进植被有机物积累。

关键词: 长枝木霉, 小麦禾谷孢囊线虫, 致死和寄生作用

Abstract: Based on field investigation and remote sensing, the spatiotemporal variations and primary influencing factors of net primary productivity (NPP) of new wetlands in the Yellow River Delta in recent 20 years were examined by using the CarnegieAmesStanford Approach (CASA). The correlation between observed and estimated NPP was significant (P<0.001), with averaged relative errors between -21.96 and 8.16. The NPP increased from coast to inland, and decreased from the banks along the river. The mean value of NPP and total NPP showed a downward trend from 1998 to 2016. The variation of mean NPP was relatively small, but the total NPP varied greatly, with the greatest total NPP occurring in 1998 and the smallest in 2010. The variation of NPP was obvious across seasons. The mean NPP was 74.25 g C·m^-2 in spring, 101.58 g C·m^-2 in summer, 41.83 g C·m^-2 in autumn, and 13.10 g C·m^-2 in winter. The estimated mean values of NPP differed with vegetation types. The estimated NPP values of various vegetations followed the Form. Robinia pseudoacacia > Form. Phragmites australis & Willow > crop > Form. Phragmites australis & Miscanthus saccharifleus & Imperatacy lindrica> Form.Phragmites australis & Tamarix chinensis> Form.Tamarix chinensis> Form. Suaeda heteroptera > Form. Spartana anglaca & Spartina alterniflora > Form.Tamarix chinensis & Suaeda heteropter a & Imperatacy lindrica. The correlation coefficient between NPP and soil soluble salt concentration was -0.389 (P<0.01). Therefore, reasonable “salt suppression with water” model can reduce soil salinity and promote the accumulation of plant organic matter.

Key words: Trichoderma longibrachiatum, Heterodera avenae, lethal and parasitic effects.

路广,韩美,徐泽华,朱继前,牛学锐. 黄河三角洲新生湿地净初级生产力时空变化[J]. 生态学杂志.

LU Guang, HAN Mei, XU Ze-hua, ZHU Ji-qian, NIU Xue-rui. Spatiotemporal variations of net primary productivity in new wetlands of the Yellow River Delta.[J]. cje.