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