Sains Malaysiana 48(11)(2019): 2317–2324

http://dx.doi.org/10.17576/jsm-2019-4811-03 

 

Spatio-Temporal Changes in Vegetation Net Primary Productivity and Its Responses to Climatic Factors in Jiangsu Province, Eastern China

(Perubahan Ruang-Masa dalam Keberhasilan Primer Bersih Vegetasi dan Responsnya terhadap Faktor Iklim di Wilayah Jiangsu, China Timur)

 

CHENG LI1,2, RANGHUI WANG2* & MOU LEONG TAN3

 

1Department of Ecology, School of Horticulture and Plant Protection, Yangzhou University, 225009 Yangzhou, Jiangsu, China

 

2Jiangsu Key Laboratory of Agricultural Meteorology, Collaborative Innovation Center of Atmospheric, Environment and Equipment Technology, Nanjing University of Information Science and Technology, 210044 Nanjing, China

 

3Geography Section, School of Humanities, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia

 

Diserahkan: 31 Mac 2019/Diterima: 15 Ogos 2019

 

ABSTRACT

Vegetation net primary productivity (NPP) is an important indicator in determining the ecological functions and carbon cycle of terrestrial ecosystems. As an important part of Chinese Yangtze River Delta region, Jiangsu is one of main grain producing areas in China. Therefore, understanding of spatio-temporal changes in NPP has a practical significance to ensure ecological sustainability in this region. In this study, we used satellite-based vegetation productivity model, the Carnegie-Ames-Stanford Approach (CASA) to assess spatio-temporal variations in NPP and analyzed the relationships between NPP and climatic factors over Jiangsu. The results showed that annual mean NPP reached up to 745.26 ± 69.21 g C m-2 year-1, with high NPP values mainly in the central and southwestern regions. Besides that, annual mean NPP increased from 2000 to 2015, with a rate of 6.54 g C m-2 year-1. The increasing trends with higher changing rate were mainly found in the northern regions of Jiangsu, whereas the decreasing trends were mainly found in central and southern Jiangsu. Moreover, the correlation analysis indicated that the mean temperature and total precipitation in spring had a significant relationship with the corresponding NPP in most part of Jiangsu. The findings will have an important significance for improving the ecosystem management in Jiangsu.

 

Keywords: CASA model; climatic factors; Jiangsu; net primary productivity

 

ABSTRAK

Keberhasilan primer bersih vegetasi (NPP) adalah satu petunjuk penting yang menunjukkan fungsi ekologi dan kitaran karbon dalam ekosistem daratan. Jiangsu merupakan kawasan penting bagi Delta Sungai Yangtze China, iaitu salah satu kawasan penghasil gandum utama di China. Justeru, pemahaman perubahan ruang-masa dalam NPP mempunyai kepentingan praktikal untuk memastikan kelestarian ekologi di kawasan ini. Dalam kajian ini, kami menggunakan model keberhasilan vegetasi berasaskan satelit, iaitu Carnegie-Ames-Stanford Approach (CASA) untuk menilai variasi ruang-masa dalam NPP serta menganalisis hubungan antara NPP dengan faktor iklim di Jiangsu. Keputusan kajian menunjukkan purata tahunan NPP mencapai 745.26 ± 69.21 g C m-2 tahun-1, dengan nilai NPP yang lebih tinggi didapati di kawasan tengah dan barat daya. Selain itu, nilai purata tahunan NPP meningkat dari tahun 2000 sehingga 2015 pada kadar 6.54 g C m-2 tahun-1. Kadar peningkatan yang lebih besar berlaku terutamanya di kawasan utara wilayah Jiangsu, manakala tren penurunan didapati di kawasan tengah dan selatan Jiangsu. Di samping itu, analisis korelasi menunjukkan bahawa purata suhu dan jumlah hujan tahunan mempunyai hubungan positif yang signifikan dengan NPP di sebahagian besar kawasan Jiangsu. Penemuan ini penting untuk meningkatkan pengurusan ekosistem di Jiangsu.

 

Kata kunci: Faktor iklim; Jiangsu; keberhasilan primer bersih; model CASA

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*Pengarang untuk surat-menyurat; email: rhwang@nuist.edu.cn

 

 

 

 

 

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